fix(player): keyboard focus, contrast and ARIA for controls and settings (#1769)

* fix(player): keyboard focus, contrast and ARIA for controls and settings

Dock and settings-panel icon buttons draw a 2px --pc-text ring on
:focus-visible, and Material's theme-coloured focus layer is off, so
keyboard focus shows on video in the light theme too. A focused selected
subtitle swatch now differs from one that is only selected.

Settings headings read --pc-text-secondary on denser glass
(--pc-glass-bg-dense, 0.86): 4.5:1 or more over mid-grey and white
frames. They wrap (overflow-wrap: anywhere, hyphens: auto), so long
German and Russian headings stay inside the sheet's heading column.

The settings panel is now radio groups only (SettingsRadioGroupDirective
over a CDK FocusKeyManager): one Tab stop per group on the checked option,
arrows, Home and End move focus without applying, and Space/Enter checks.
The dialog and its groups are named by real h2/h3/h4 headings, the
load-file action sits outside the subtitle radio group, the subtitle and
speed chips carry their value in their name ("Subtitles: English"), and
tune has aria-haspopup="dialog".

Adds a web E2E for the keyboard path in both themes with an axe check on
the open panel, and de/ru sheet heading wrapping; axe-core is a new dev
dependency for it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* fix(player): arrows check settings radios; subtitle chip reads On

Review follow-up:
- Arrow keys, Home and End now check the settings radio they reach, as a
  native radio group does (the directive clicks it, so the template's
  handler applies the choice); an option the engine already reports as
  checked is not applied again.
- With subtitles on but no track marked selected yet (the engine can
  report the switch before the track list), the subtitle chip reads and
  announces "On" (new SUBTITLES_ON key, 19 locales) instead of "Off".
- The swatch row has 4px padding on every side, so the outer focus ring
  is not clipped at the scroll edge of the panel body.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* fix(player): re-apply a settings radio while a switch is pending

The arrow-key check skipped any option the engine still reported as
checked. Arrowing from audio track A to B and back to A before the engine
confirmed B therefore sent no command for A, and playback ended on B with
focus on A. An arrow move always lands on an option other than the last
one applied, so it now applies unconditionally.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

.changes/player-controls-keyboard-access.md

@@ -0,0 +1,9 @@
+---
+type: fix
+area: player
+---
+
+Player controls now show a clear focus ring in the light theme too. The
+settings panel works with arrow keys and screen readers, and the subtitle and
+speed buttons announce their current value. Settings headings are easier to
+read over bright video and wrap in long translations instead of overflowing.

apps/web-e2e/src/player-controls-keyboard.e2e.ts

@@ -0,0 +1,410 @@
+import type { Locator, Page } from '@playwright/test';
+import { readFileSync } from 'node:fs';
+import { pressTab } from './e2e-helpers';
+import { expect, test } from './fixtures';
+import {
+    importPlaylist,
+    selectPlayer,
+    serveClip,
+    startClip,
+} from './player-settings-panel.fixture';
+
+/**
+ * Keyboard and assistive-technology access to the shared controls in both
+ * app themes: every dock control and every settings choice shows a focus
+ * ring in the overlay's own colour, each settings radio group is one Tab
+ * stop with arrow-key navigation, the open panel passes axe, its headings
+ * stay readable over bright frames, and long German and Russian headings
+ * wrap inside the compact sheet. ArtPlayer is used because it offers the
+ * fullest panel (subtitle file, size and colour, speed).
+ */
+
+test.use({ serviceWorkers: 'block' });
+
+/** `--pc-text`, the overlay's text colour, as computed styles report it. */
+const RING_COLOR = 'rgb(231, 236, 243)';
+const AXE_SOURCE = readFileSync(require.resolve('axe-core/axe.min.js'), 'utf8');
+
+interface FocusStop {
+    label: string;
+    role: string | null;
+    group: string | null;
+    checked: string | null;
+    iconButton: boolean;
+    outline: string;
+    outlineColor: string;
+}
+
+/** Describes the focused element and the ring it draws. */
+function focusStop(page: Page): Promise<FocusStop | null> {
+    return page.evaluate(() => {
+        const element = document.activeElement;
+        if (!(element instanceof HTMLElement)) return null;
+        const style = getComputedStyle(element);
+        const group = element.closest('[role="radiogroup"]');
+        return {
+            label:
+                element.getAttribute('aria-label') ??
+                element.textContent?.trim() ??
+                '',
+            role: element.getAttribute('role'),
+            group: group?.getAttribute('aria-labelledby') ?? null,
+            checked: element.getAttribute('aria-checked'),
+            iconButton: element.matches('button[mat-icon-button]'),
+            outline: `${style.outlineStyle} ${style.outlineWidth}`,
+            outlineColor: style.outlineColor,
+        };
+    });
+}
+
+function focusIsInside(page: Page, selector: string): Promise<boolean> {
+    return page.evaluate(
+        (within) => !!document.activeElement?.closest(within),
+        selector
+    );
+}
+
+/**
+ * Presses Tab (or Shift+Tab) until focus lies inside `target`, or leaves
+ * `within` when that is given, and returns every stop on the way — the
+ * last one included.
+ */
+async function tabUntil(
+    page: Page,
+    browserName: string,
+    options: {
+        target?: string;
+        within?: string;
+        direction?: 'forward' | 'backward';
+        max?: number;
+    }
+): Promise<FocusStop[]> {
+    const stops: FocusStop[] = [];
+    for (let step = 0; step < (options.max ?? 20); step++) {
+        await pressTab(page, browserName, options.direction);
+        if (options.within && !(await focusIsInside(page, options.within))) {
+            return stops;
+        }
+        const stop = await focusStop(page);
+        if (stop) stops.push(stop);
+        if (options.target && (await focusIsInside(page, options.target))) {
+            return stops;
+        }
+    }
+    return stops;
+}
+
+async function applyTheme(page: Page, theme: 'light' | 'dark') {
+    await page.evaluate((dark) => {
+        document.body.classList.toggle('dark-theme', dark);
+    }, theme === 'dark');
+}
+
+async function expectNoAxeViolations(panel: Locator) {
+    await panel.page().evaluate(AXE_SOURCE);
+    const violations = await panel.evaluate(async (element) => {
+        const axe = (window as unknown as { axe: typeof import('axe-core') })
+            .axe;
+        const results = await axe.run(element, { resultTypes: ['violations'] });
+        return results.violations.map((violation) => ({
+            id: violation.id,
+            nodes: violation.nodes.map((node) => node.target.join(' ')),
+        }));
+    });
+    expect(violations).toEqual([]);
+}
+
+/**
+ * Heading contrast on the panel glass composited over a mid-grey and a white
+ * frame — the video behind the panel can be anything.
+ */
+function headingContrast(panel: Locator) {
+    return panel.evaluate((host) => {
+        type Color = [number, number, number, number];
+        const canvas = document.createElement('canvas');
+        canvas.width = canvas.height = 1;
+        const ctx = canvas.getContext('2d') as CanvasRenderingContext2D;
+        const parse = (css: string): Color => {
+            ctx.clearRect(0, 0, 1, 1);
+            ctx.fillStyle = css;
+            ctx.fillRect(0, 0, 1, 1);
+            const [r, g, b, a] = ctx.getImageData(0, 0, 1, 1).data;
+            return [r, g, b, a / 255];
+        };
+        // `front` over an opaque `back`: the result is opaque too.
+        const over = (front: Color, back: Color): Color => [
+            front[0] * front[3] + back[0] * (1 - front[3]),
+            front[1] * front[3] + back[1] * (1 - front[3]),
+            front[2] * front[3] + back[2] * (1 - front[3]),
+            1,
+        ];
+        const luminance = (color: Color) => {
+            const [r, g, b] = color.slice(0, 3).map((value) => {
+                const s = value / 255;
+                return s <= 0.04045 ? s / 12.92 : ((s + 0.055) / 1.055) ** 2.4;
+            });
+            return r * 0.2126 + g * 0.7152 + b * 0.0722;
+        };
+        const ratio = (a: Color, b: Color) => {
+            const [hi, lo] = [luminance(a), luminance(b)].sort((x, y) => y - x);
+            return (hi + 0.05) / (lo + 0.05);
+        };
+        const glass = parse(getComputedStyle(host).backgroundColor);
+        return Array.from(host.querySelectorAll('h3, h4'), (heading) => {
+            const text = parse(getComputedStyle(heading).color);
+            const on = (frame: Color) => {
+                const surface = over(glass, frame);
+                return ratio(over(text, surface), surface);
+            };
+            return {
+                heading: heading.textContent?.trim(),
+                midGrey: on([128, 128, 128, 1]),
+                white: on([255, 255, 255, 1]),
+            };
+        });
+    });
+}
+
+test('@web @playback keyboard reaches the dock and the settings radios with a visible ring in both themes', async ({
+    page,
+    browserName,
+}) => {
+    test.setTimeout(120_000);
+    // Chips and the side panel need a player of at least 960px.
+    await page.setViewportSize({ width: 1600, height: 1000 });
+    await serveClip(page);
+    await selectPlayer(page, 'ArtPlayer');
+    await importPlaylist(page);
+    const { view, video, controls } = await startClip(page);
+    // Park the pointer on the video away from the dock and the panel: a
+    // control that slides in under a resting pointer shows its hover
+    // tooltip, and a visible tooltip spends the next Escape on itself.
+    await view.hover({ position: { x: 24, y: 24 } });
+    const tune = controls.locator(
+        '[data-test-id="player-controls-settings-button"]'
+    );
+    const panel = controls.getByRole('dialog', { name: 'Settings' });
+
+    for (const theme of ['light', 'dark'] as const) {
+        await applyTheme(page, theme);
+
+        // --- The dock, from the timeline to the last control. -------------
+        await controls
+            .getByRole('slider', { name: 'Playback position' })
+            .focus();
+        const dockButtons = (
+            await tabUntil(page, browserName, { within: 'app-player-controls' })
+        ).filter((stop) => stop.iconButton);
+        // Every icon button wears the ring, whatever the app theme.
+        expect(dockButtons.map((stop) => stop.outline)).toEqual(
+            dockButtons.map(() => 'solid 2px')
+        );
+        expect(dockButtons.map((stop) => stop.outlineColor)).toEqual(
+            dockButtons.map(() => RING_COLOR)
+        );
+        expect(dockButtons.map((stop) => stop.label)).toEqual(
+            expect.arrayContaining([
+                'Mute',
+                'Back 10 seconds',
+                'Forward 10 seconds',
+                'Settings',
+                'Enter fullscreen',
+            ])
+        );
+
+        // --- Open the panel from the keyboard: focus moves into it. -------
+        await tabUntil(page, browserName, {
+            target: '[data-test-id="player-controls-settings-button"]',
+            direction: 'backward',
+            max: 10,
+        });
+        await expect(tune).toBeFocused();
+        await expect(tune).toHaveAttribute('aria-haspopup', 'dialog');
+        await page.screenshot({
+            path: test.info().outputPath(`${theme}-dock-focus.png`),
+        });
+        await page.keyboard.press('Enter');
+        await expect(panel).toBeVisible();
+        await expect(panel).toBeFocused();
+
+        // Tab enters every radio group once, on its checked option, and
+        // every stop wears the ring.
+        const panelStops = await tabUntil(page, browserName, {
+            target: '[data-test-id="player-settings-speed"]',
+        });
+        expect(panelStops.map((stop) => stop.outline)).toEqual(
+            panelStops.map(() => 'solid 2px')
+        );
+        expect(panelStops.map((stop) => stop.outlineColor)).toEqual(
+            panelStops.map(() => RING_COLOR)
+        );
+        const radioStops = panelStops.filter((stop) => stop.role === 'radio');
+        // Subtitle size, subtitle colour and speed: one stop each, checked.
+        expect(radioStops.map((stop) => stop.checked)).toEqual([
+            'true',
+            'true',
+            'true',
+        ]);
+        expect(new Set(radioStops.map((stop) => stop.group)).size).toBe(3);
+
+        // --- Arrows move focus and apply the option they reach. ----------
+        const speedGroup = panel.locator(
+            '[data-test-id="player-settings-speed"] [role="radiogroup"]'
+        );
+        const rate = () =>
+            video.evaluate((el: HTMLVideoElement) => el.playbackRate);
+        await page.keyboard.press('ArrowRight');
+        const moved = await focusStop(page);
+        expect(moved?.role).toBe('radio');
+        await expect.poll(rate).toBe(Number.parseFloat(moved?.label ?? ''));
+        await expect(
+            speedGroup.locator('[role="radio"][aria-checked="true"]')
+        ).toHaveText(moved?.label ?? '');
+        await page.keyboard.press('Home');
+        expect((await focusStop(page))?.label).toBe('0.5×');
+        await expect.poll(rate).toBe(0.5);
+        await expect(
+            speedGroup.locator('[role="radio"][aria-checked="true"]')
+        ).toHaveText('0.5×');
+        // The ends wrap, as in a native radio group.
+        await page.keyboard.press('ArrowLeft');
+        expect((await focusStop(page))?.label).toBe('2×');
+        await expect.poll(rate).toBe(2);
+        await expect(speedGroup.locator('[tabindex="0"]')).toHaveText('2×');
+        // Leaving and re-entering lands on the checked option — the one the
+        // engine reports, so wait for it to confirm the switch first.
+        await expect(
+            speedGroup.locator('[role="radio"][aria-checked="true"]')
+        ).toHaveText('2×');
+        await pressTab(page, browserName, 'backward');
+        await pressTab(page, browserName);
+        expect((await focusStop(page))?.label).toBe('2×');
+
+        // --- A focused selected swatch differs from a selected one. -------
+        await tabUntil(page, browserName, {
+            target: '.player-settings__swatches',
+            direction: 'backward',
+            max: 5,
+        });
+        const focusedSwatch = panel.locator('.player-settings__swatch:focus');
+        await expect(focusedSwatch).toHaveAttribute('aria-checked', 'true');
+        await expect(focusedSwatch).toHaveCSS('outline-style', 'solid');
+        // The arrow checks the next swatch, which takes focus and the ring.
+        await page.keyboard.press('ArrowRight');
+        await expect(focusedSwatch).toHaveAttribute('aria-checked', 'true');
+        await expect(focusedSwatch).toHaveCSS('outline-style', 'solid');
+        // Tab moves on to the speed group: the checked swatch keeps its
+        // selected border but loses the ring.
+        await pressTab(page, browserName);
+        expect(
+            await focusIsInside(page, '[data-test-id="player-settings-speed"]')
+        ).toBe(true);
+        const selectedOnly = panel.locator(
+            '.player-settings__swatch[aria-checked="true"]'
+        );
+        await expect(selectedOnly).toHaveCount(1);
+        await expect(selectedOnly).not.toBeFocused();
+        await expect(selectedOnly).toHaveCSS('outline-style', 'none');
+        await expect(selectedOnly).toHaveCSS(
+            'border-top-color',
+            'rgb(255, 255, 255)'
+        );
+
+        // --- Headings, axe and closing. ----------------------------------
+        const contrast = await headingContrast(panel);
+        expect(contrast.length).toBeGreaterThan(0);
+        expect(
+            contrast.filter(
+                (heading) => heading.midGrey < 4.5 || heading.white < 4.5
+            )
+        ).toEqual([]);
+        await expectNoAxeViolations(panel);
+        await page.screenshot({
+            path: test.info().outputPath(`${theme}-panel-focus.png`),
+        });
+
+        // Focus is on a speed radio, which has no tooltip. Material spends
+        // an Escape on any tooltip still showing (the swatch's fades out),
+        // so wait for it to go before closing.
+        await expect(page.locator('.mat-mdc-tooltip')).toHaveCount(0);
+        await page.keyboard.press('Escape');
+        await expect(panel).toHaveCount(0);
+        await expect(tune).toBeFocused();
+    }
+});
+
+for (const [locale, speedHeading] of [
+    ['de', 'Wiedergabegeschwindigkeit'],
+    ['ru', 'Скорость воспроизведения'],
+] as const) {
+    test(`@web @playback settings sheet headings wrap in the ${locale} locale`, async ({
+        page,
+    }) => {
+        test.setTimeout(120_000);
+        await page.setViewportSize({ width: 900, height: 700 });
+        await serveClip(page);
+        await selectPlayer(page, 'ArtPlayer');
+        const playlistUrl = await importPlaylist(page);
+
+        await page.goto('/workspace/settings/general');
+        await page.locator('[data-test-id="select-language"]').click();
+        await page.locator(`mat-option[data-test-id="${locale}"]`).click();
+        const save = page.locator('[data-test-id="save-settings"]');
+        await save.click();
+        await expect(save).toBeHidden();
+
+        await page.goto(playlistUrl);
+        const { controls } = await startClip(page);
+        await controls
+            .locator('[data-test-id="player-controls-settings-button"]')
+            .click();
+        const sheet = controls.locator(
+            '[data-test-id="player-controls-settings-panel"]'
+        );
+        await expect(sheet).toHaveClass(/player-controls__settings--sheet/);
+        await expect(
+            sheet.locator('[data-test-id="player-settings-speed"] h3')
+        ).toHaveText(speedHeading);
+
+        for (const theme of ['light', 'dark'] as const) {
+            await applyTheme(page, theme);
+            const headings = await sheet.evaluate((host) =>
+                Array.from(host.querySelectorAll('h3, h4'), (heading) => {
+                    const box = heading.getBoundingClientRect();
+                    const control = heading.nextElementSibling;
+                    const style = getComputedStyle(heading);
+                    return {
+                        text: heading.textContent?.trim(),
+                        overflow: heading.scrollWidth - heading.clientWidth,
+                        // A group heading sits in the sheet's left column,
+                        // beside its control.
+                        intoControl:
+                            heading.tagName === 'H3' && control
+                                ? box.right -
+                                  control.getBoundingClientRect().left
+                                : 0,
+                        lines: Math.round(
+                            (box.height -
+                                Number.parseFloat(style.paddingTop) -
+                                Number.parseFloat(style.paddingBottom)) /
+                                Number.parseFloat(style.lineHeight)
+                        ),
+                    };
+                })
+            );
+            for (const heading of headings) {
+                expect(heading.overflow, heading.text).toBeLessThanOrEqual(0);
+                expect(heading.intoControl, heading.text).toBeLessThanOrEqual(
+                    0
+                );
+            }
+            expect(
+                headings.find((heading) => heading.text === speedHeading)?.lines
+            ).toBeGreaterThan(1);
+            await expectNoAxeViolations(sheet);
+        }
+        await page.screenshot({
+            path: test.info().outputPath(`${locale}-sheet.png`),
+        });
+    });
+}

apps/web-e2e/src/player-settings-panel.e2e.ts

@@ -1,7 +1,10 @@
-import type { Page } from '@playwright/test';
-import { readFileSync } from 'node:fs';
-import { join } from 'node:path';
 import { expect, test } from './fixtures';
+import {
+    importPlaylist,
+    selectPlayer,
+    serveClip,
+    startClip,
+} from './player-settings-panel.fixture';
 
 /**
  * The shared controls' settings panel: on a wide player the speed chip opens
@@ -11,100 +14,8 @@ import { expect, test } from './fixtures';
  * remote media is involved.
  */
 
-const FIXTURE_HOST = 'https://player-settings-fixture.local';
-const PLAYLIST = [
-    '#EXTM3U',
-    '#EXTINF:-1 group-title="Movies",Settings Clip',
-    `${FIXTURE_HOST}/clip.mp4`,
-].join('\n');
-
 test.use({ serviceWorkers: 'block' });
 
-async function serveClip(page: Page): Promise<void> {
-    const clip = readFileSync(
-        join(__dirname, 'fixtures/playback/episode.webm')
-    );
-    await page.route(`${FIXTURE_HOST}/**`, async (route) => {
-        const range = /^bytes=(\d*)-(\d*)$/.exec(
-            route.request().headers()['range'] ?? ''
-        );
-        const last = clip.length - 1;
-        const start = range?.[1]
-            ? Number(range[1])
-            : range?.[2]
-              ? Math.max(0, clip.length - Number(range[2]))
-              : 0;
-        const end =
-            range?.[1] && range[2] ? Math.min(Number(range[2]), last) : last;
-        await route.fulfill({
-            status: range ? 206 : 200,
-            headers: {
-                'content-type': 'video/webm',
-                'accept-ranges': 'bytes',
-                'content-length': String(end - start + 1),
-                ...(range
-                    ? {
-                          'content-range': `bytes ${start}-${end}/${clip.length}`,
-                      }
-                    : {}),
-            },
-            body: clip.subarray(start, end + 1),
-        });
-    });
-}
-
-async function selectHtml5Player(page: Page): Promise<void> {
-    await page.goto('/workspace/settings/playback');
-    const select = page.locator('[data-test-id="select-video-player"]');
-    await expect(select).toBeVisible();
-    const previous = await select.innerText();
-    await select.click();
-    await page
-        .getByRole('option', { name: 'HTML5 video player', exact: true })
-        .click();
-    if (!previous.includes('HTML5 video player')) {
-        const saveButton = page.getByRole('button', { name: 'Save changes' });
-        await saveButton.click();
-        await expect(saveButton).toBeHidden();
-    }
-}
-
-async function importPlaylist(page: Page): Promise<void> {
-    await page.goto('/');
-    await page.getByRole('button', { name: 'Add playlist' }).click();
-    const dialog = page.getByRole('dialog');
-    await expect(dialog).toBeVisible();
-    await dialog.getByRole('radio', { name: /Raw m3u text/i }).click();
-    await dialog.getByLabel('Insert m3u(8) playlist as text').fill(PLAYLIST);
-    await Promise.all([
-        page.waitForURL(/\/workspace\/playlists\/.+\/all$/),
-        dialog.getByRole('button', { name: 'Import', exact: true }).click(),
-    ]);
-    await expect(page.getByText('1 channels')).toBeVisible();
-}
-
-async function startClip(page: Page) {
-    await page
-        .locator('[data-test-id="channel-item"]')
-        .filter({ hasText: 'Settings Clip' })
-        .click();
-    const view = page.locator('app-web-player-view');
-    const video = view.locator('video');
-    await expect
-        .poll(() =>
-            video.evaluate(
-                (el: HTMLVideoElement) =>
-                    Number.isFinite(el.duration) && el.duration > 5
-            )
-        )
-        .toBe(true);
-    // Reveal the dock and keep it revealed for the assertions below.
-    await view.hover();
-    const controls = view.locator('app-player-controls');
-    await controls.getByRole('button', { name: 'Pause', exact: true }).click();
-    return { view, video, controls };
-}
-
 test('@web @playback settings panel opens from the speed chip and applies in place', async ({
     page,
 }) => {
@@ -112,7 +23,7 @@ test('@web @playback settings panel opens from the speed chip and applies in pla
     // Chips and the side panel need a player of at least 960px.
     await page.setViewportSize({ width: 1600, height: 1000 });
     await serveClip(page);
-    await selectHtml5Player(page);
+    await selectPlayer(page);
     await importPlaylist(page);
     const { video, controls } = await startClip(page);
 
@@ -164,7 +75,7 @@ test('@web @playback compact player folds the chips into a tune button with a bo
     test.setTimeout(90_000);
     await page.setViewportSize({ width: 900, height: 700 });
     await serveClip(page);
-    await selectHtml5Player(page);
+    await selectPlayer(page);
     await importPlaylist(page);
     const { view, controls } = await startClip(page);
 

apps/web-e2e/src/player-settings-panel.fixture.ts

@@ -0,0 +1,114 @@
+import type { Page } from '@playwright/test';
+import { readFileSync } from 'node:fs';
+import { join } from 'node:path';
+import { expect } from './fixtures';
+
+/**
+ * A one-channel M3U playlist whose only stream is the local test clip, served
+ * through route interception: the shared-controls specs play it in a web
+ * engine without any remote media.
+ */
+const FIXTURE_HOST = 'https://player-settings-fixture.local';
+export const CLIP_TITLE = 'Settings Clip';
+const PLAYLIST = [
+    '#EXTM3U',
+    `#EXTINF:-1 group-title="Movies",${CLIP_TITLE}`,
+    `${FIXTURE_HOST}/clip.mp4`,
+].join('\n');
+
+export async function serveClip(page: Page): Promise<void> {
+    const clip = readFileSync(
+        join(__dirname, 'fixtures/playback/episode.webm')
+    );
+    await page.route(`${FIXTURE_HOST}/**`, async (route) => {
+        const range = /^bytes=(\d*)-(\d*)$/.exec(
+            route.request().headers()['range'] ?? ''
+        );
+        const last = clip.length - 1;
+        const start = range?.[1]
+            ? Number(range[1])
+            : range?.[2]
+              ? Math.max(0, clip.length - Number(range[2]))
+              : 0;
+        const end =
+            range?.[1] && range[2] ? Math.min(Number(range[2]), last) : last;
+        await route.fulfill({
+            status: range ? 206 : 200,
+            headers: {
+                'content-type': 'video/webm',
+                'accept-ranges': 'bytes',
+                'content-length': String(end - start + 1),
+                ...(range
+                    ? {
+                          'content-range': `bytes ${start}-${end}/${clip.length}`,
+                      }
+                    : {}),
+            },
+            body: clip.subarray(start, end + 1),
+        });
+    });
+}
+
+export async function selectPlayer(
+    page: Page,
+    player = 'HTML5 video player'
+): Promise<void> {
+    await page.goto('/workspace/settings/playback');
+    const select = page.locator('[data-test-id="select-video-player"]');
+    await expect(select).toBeVisible();
+    const previous = await select.innerText();
+    await select.click();
+    await page.getByRole('option', { name: player, exact: true }).click();
+    if (!previous.includes(player)) {
+        const saveButton = page.getByRole('button', { name: 'Save changes' });
+        await saveButton.click();
+        await expect(saveButton).toBeHidden();
+    }
+}
+
+/** Imports the playlist and returns the URL of its channel list. */
+export async function importPlaylist(page: Page): Promise<string> {
+    await page.goto('/');
+    await page.getByRole('button', { name: 'Add playlist' }).click();
+    const dialog = page.getByRole('dialog');
+    await expect(dialog).toBeVisible();
+    await dialog.getByRole('radio', { name: /Raw m3u text/i }).click();
+    await dialog.getByLabel('Insert m3u(8) playlist as text').fill(PLAYLIST);
+    await Promise.all([
+        page.waitForURL(/\/workspace\/playlists\/.+\/all$/),
+        dialog.getByRole('button', { name: 'Import', exact: true }).click(),
+    ]);
+    await expect(page.getByText('1 channels')).toBeVisible();
+    return page.url();
+}
+
+/**
+ * Starts the clip and pauses it with the dock revealed. The play button is
+ * found by test id, so this works in every app language.
+ */
+export async function startClip(page: Page) {
+    await page
+        .locator('[data-test-id="channel-item"]')
+        .filter({ hasText: CLIP_TITLE })
+        .click();
+    const view = page.locator('app-web-player-view');
+    const video = view.locator('video');
+    await expect
+        .poll(() =>
+            video.evaluate(
+                (el: HTMLVideoElement) =>
+                    Number.isFinite(el.duration) &&
+                    el.duration > 5 &&
+                    !el.paused
+            )
+        )
+        .toBe(true);
+    // Reveal the dock and keep it revealed for the assertions below.
+    await view.hover();
+    const controls = view.locator('app-player-controls');
+    await controls.locator('[data-test-id="player-controls-play"]').click();
+    await expect
+        .poll(() => video.evaluate((el: HTMLVideoElement) => el.paused))
+        .toBe(true);
+    return { view, video, controls };
+}

apps/web/src/assets/i18n/ar.json

@@ -620,6 +620,7 @@
             "AUDIO_TRACKS": "مسارات الصوت",
             "SUBTITLES": "الترجمات",
             "SUBTITLES_OFF": "إيقاف",
+            "SUBTITLES_ON": "تشغيل",
             "QUALITY": "الجودة",
             "QUALITY_AUTO": "تلقائي",
             "TRACK_DEFAULT": "افتراضي",
@@ -627,6 +628,7 @@
             "SUBTITLE_TRACK_FALLBACK": "ترجمة {{index}}",
             "PLAYBACK_SPEED": "سرعة التشغيل",
             "SPEED_TOOLTIP": "السرعة: {{speed}}",
+            "SUBTITLES_TOOLTIP": "الترجمات: {{subtitles}}",
             "ASPECT_RATIO": "نسبة العرض إلى الارتفاع",
             "ASPECT_TOOLTIP": "النسبة: {{aspect}}",
             "ASPECT_DEFAULT": "افتراضي",

apps/web/src/assets/i18n/ary.json

@@ -620,6 +620,7 @@
             "AUDIO_TRACKS": "مسارات الصوت",
             "SUBTITLES": "الترجمة",
             "SUBTITLES_OFF": "معطلة",
+            "SUBTITLES_ON": "مفعلة",
             "QUALITY": "الجودة",
             "QUALITY_AUTO": "تلقائي",
             "TRACK_DEFAULT": "افتراضي",
@@ -627,6 +628,7 @@
             "SUBTITLE_TRACK_FALLBACK": "ترجمة {{index}}",
             "PLAYBACK_SPEED": "سرعة التشغيل",
             "SPEED_TOOLTIP": "السرعة: {{speed}}",
+            "SUBTITLES_TOOLTIP": "الترجمة: {{subtitles}}",
             "ASPECT_RATIO": "نسبة الأبعاد",
             "ASPECT_TOOLTIP": "الأبعاد: {{aspect}}",
             "ASPECT_DEFAULT": "افتراضي",

apps/web/src/assets/i18n/by.json

@@ -620,6 +620,7 @@
             "AUDIO_TRACKS": "Аўдыядарожкі",
             "SUBTITLES": "Субтытры",
             "SUBTITLES_OFF": "Выкл.",
+            "SUBTITLES_ON": "Укл.",
             "QUALITY": "Якасць",
             "QUALITY_AUTO": "Аўта",
             "TRACK_DEFAULT": "Па змаўчанні",
@@ -627,6 +628,7 @@
             "SUBTITLE_TRACK_FALLBACK": "Субтытры {{index}}",
             "PLAYBACK_SPEED": "Хуткасць прайгравання",
             "SPEED_TOOLTIP": "Хуткасць: {{speed}}",
+            "SUBTITLES_TOOLTIP": "Субтытры: {{subtitles}}",
             "ASPECT_RATIO": "Суадносіны бакоў",
             "ASPECT_TOOLTIP": "Суадносіны: {{aspect}}",
             "ASPECT_DEFAULT": "Па змаўчанні",

apps/web/src/assets/i18n/de.json

@@ -620,6 +620,7 @@
             "AUDIO_TRACKS": "Tonspuren",
             "SUBTITLES": "Untertitel",
             "SUBTITLES_OFF": "Aus",
+            "SUBTITLES_ON": "An",
             "QUALITY": "Qualität",
             "QUALITY_AUTO": "Automatisch",
             "TRACK_DEFAULT": "Standard",
@@ -627,6 +628,7 @@
             "SUBTITLE_TRACK_FALLBACK": "Untertitel {{index}}",
             "PLAYBACK_SPEED": "Wiedergabegeschwindigkeit",
             "SPEED_TOOLTIP": "Geschwindigkeit: {{speed}}",
+            "SUBTITLES_TOOLTIP": "Untertitel: {{subtitles}}",
             "ASPECT_RATIO": "Seitenverhältnis",
             "ASPECT_TOOLTIP": "Seitenverhältnis: {{aspect}}",
             "ASPECT_DEFAULT": "Standard",

apps/web/src/assets/i18n/el.json

@@ -620,6 +620,7 @@
             "AUDIO_TRACKS": "Κομμάτια ήχου",
             "SUBTITLES": "Υπότιτλοι",
             "SUBTITLES_OFF": "Ανενεργοί",
+            "SUBTITLES_ON": "Ενεργοί",
             "QUALITY": "Ποιότητα",
             "QUALITY_AUTO": "Αυτόματη",
             "TRACK_DEFAULT": "Προεπιλογή",
@@ -627,6 +628,7 @@
             "SUBTITLE_TRACK_FALLBACK": "Υπότιτλος {{index}}",
             "PLAYBACK_SPEED": "Ταχύτητα αναπαραγωγής",
             "SPEED_TOOLTIP": "Ταχύτητα: {{speed}}",
+            "SUBTITLES_TOOLTIP": "Υπότιτλοι: {{subtitles}}",
             "ASPECT_RATIO": "Αναλογία εικόνας",
             "ASPECT_TOOLTIP": "Αναλογία: {{aspect}}",
             "ASPECT_DEFAULT": "Προεπιλογή",

apps/web/src/assets/i18n/en.json

@@ -620,6 +620,7 @@
             "AUDIO_TRACKS": "Audio tracks",
             "SUBTITLES": "Subtitles",
             "SUBTITLES_OFF": "Off",
+            "SUBTITLES_ON": "On",
             "QUALITY": "Quality",
             "QUALITY_AUTO": "Auto",
             "TRACK_DEFAULT": "Default",
@@ -627,6 +628,7 @@
             "SUBTITLE_TRACK_FALLBACK": "Subtitle {{index}}",
             "PLAYBACK_SPEED": "Playback speed",
             "SPEED_TOOLTIP": "Speed: {{speed}}",
+            "SUBTITLES_TOOLTIP": "Subtitles: {{subtitles}}",
             "ASPECT_RATIO": "Aspect ratio",
             "ASPECT_TOOLTIP": "Aspect: {{aspect}}",
             "ASPECT_DEFAULT": "Default",

apps/web/src/assets/i18n/es.json

@@ -620,6 +620,7 @@
             "AUDIO_TRACKS": "Pistas de audio",
             "SUBTITLES": "Subtítulos",
             "SUBTITLES_OFF": "Desactivados",
+            "SUBTITLES_ON": "Activados",
             "QUALITY": "Calidad",
             "QUALITY_AUTO": "Automática",
             "TRACK_DEFAULT": "Predeterminada",
@@ -627,6 +628,7 @@
             "SUBTITLE_TRACK_FALLBACK": "Subtítulo {{index}}",
             "PLAYBACK_SPEED": "Velocidad de reproducción",
             "SPEED_TOOLTIP": "Velocidad: {{speed}}",
+            "SUBTITLES_TOOLTIP": "Subtítulos: {{subtitles}}",
             "ASPECT_RATIO": "Relación de aspecto",
             "ASPECT_TOOLTIP": "Aspecto: {{aspect}}",
             "ASPECT_DEFAULT": "Predeterminada",

apps/web/src/assets/i18n/fr.json

@@ -620,6 +620,7 @@
             "AUDIO_TRACKS": "Pistes audio",
             "SUBTITLES": "Sous-titres",
             "SUBTITLES_OFF": "Désactivés",
+            "SUBTITLES_ON": "Activés",
             "QUALITY": "Qualité",
             "QUALITY_AUTO": "Auto",
             "TRACK_DEFAULT": "Par défaut",
@@ -627,6 +628,7 @@
             "SUBTITLE_TRACK_FALLBACK": "Sous-titre {{index}}",
             "PLAYBACK_SPEED": "Vitesse de lecture",
             "SPEED_TOOLTIP": "Vitesse : {{speed}}",
+            "SUBTITLES_TOOLTIP": "Sous-titres : {{subtitles}}",
             "ASPECT_RATIO": "Format d'image",
             "ASPECT_TOOLTIP": "Format : {{aspect}}",
             "ASPECT_DEFAULT": "Par défaut",

apps/web/src/assets/i18n/hu.json

@@ -620,6 +620,7 @@
             "AUDIO_TRACKS": "Hangsávok",
             "SUBTITLES": "Feliratok",
             "SUBTITLES_OFF": "Kikapcsolva",
+            "SUBTITLES_ON": "Bekapcsolva",
             "QUALITY": "Minőség",
             "QUALITY_AUTO": "Automatikus",
             "TRACK_DEFAULT": "Alapértelmezett",
@@ -627,6 +628,7 @@
             "SUBTITLE_TRACK_FALLBACK": "{{index}}. feliratsáv",
             "PLAYBACK_SPEED": "Lejátszási sebesség",
             "SPEED_TOOLTIP": "Sebesség: {{speed}}",
+            "SUBTITLES_TOOLTIP": "Feliratok: {{subtitles}}",
             "ASPECT_RATIO": "Képarány",
             "ASPECT_TOOLTIP": "Képarány: {{aspect}}",
             "ASPECT_DEFAULT": "Alapértelmezett",

apps/web/src/assets/i18n/it.json

@@ -620,6 +620,7 @@
             "AUDIO_TRACKS": "Tracce audio",
             "SUBTITLES": "Sottotitoli",
             "SUBTITLES_OFF": "Disattivati",
+            "SUBTITLES_ON": "Attivati",
             "QUALITY": "Qualità",
             "QUALITY_AUTO": "Automatica",
             "TRACK_DEFAULT": "Predefinita",
@@ -627,6 +628,7 @@
             "SUBTITLE_TRACK_FALLBACK": "Sottotitoli {{index}}",
             "PLAYBACK_SPEED": "Velocità di riproduzione",
             "SPEED_TOOLTIP": "Velocità: {{speed}}",
+            "SUBTITLES_TOOLTIP": "Sottotitoli: {{subtitles}}",
             "ASPECT_RATIO": "Proporzioni",
             "ASPECT_TOOLTIP": "Proporzioni: {{aspect}}",
             "ASPECT_DEFAULT": "Predefinite",

apps/web/src/assets/i18n/ja.json

@@ -620,6 +620,7 @@
             "AUDIO_TRACKS": "音声トラック",
             "SUBTITLES": "字幕",
             "SUBTITLES_OFF": "オフ",
+            "SUBTITLES_ON": "オン",
             "QUALITY": "画質",
             "QUALITY_AUTO": "自動",
             "TRACK_DEFAULT": "デフォルト",
@@ -627,6 +628,7 @@
             "SUBTITLE_TRACK_FALLBACK": "字幕 {{index}}",
             "PLAYBACK_SPEED": "再生速度",
             "SPEED_TOOLTIP": "速度：{{speed}}",
+            "SUBTITLES_TOOLTIP": "字幕：{{subtitles}}",
             "ASPECT_RATIO": "アスペクト比",
             "ASPECT_TOOLTIP": "アスペクト比：{{aspect}}",
             "ASPECT_DEFAULT": "デフォルト",

apps/web/src/assets/i18n/ko.json

@@ -620,6 +620,7 @@
             "AUDIO_TRACKS": "오디오 트랙",
             "SUBTITLES": "자막",
             "SUBTITLES_OFF": "끄기",
+            "SUBTITLES_ON": "켜기",
             "QUALITY": "화질",
             "QUALITY_AUTO": "자동",
             "TRACK_DEFAULT": "기본",
@@ -627,6 +628,7 @@
             "SUBTITLE_TRACK_FALLBACK": "자막 {{index}}",
             "PLAYBACK_SPEED": "재생 속도",
             "SPEED_TOOLTIP": "속도: {{speed}}",
+            "SUBTITLES_TOOLTIP": "자막: {{subtitles}}",
             "ASPECT_RATIO": "화면 비율",
             "ASPECT_TOOLTIP": "비율: {{aspect}}",
             "ASPECT_DEFAULT": "기본",

apps/web/src/assets/i18n/nl.json

@@ -620,6 +620,7 @@
             "AUDIO_TRACKS": "Audiosporen",
             "SUBTITLES": "Ondertiteling",
             "SUBTITLES_OFF": "Uit",
+            "SUBTITLES_ON": "Aan",
             "QUALITY": "Kwaliteit",
             "QUALITY_AUTO": "Automatisch",
             "TRACK_DEFAULT": "Standaard",
@@ -627,6 +628,7 @@
             "SUBTITLE_TRACK_FALLBACK": "Ondertitel {{index}}",
             "PLAYBACK_SPEED": "Afspeelsnelheid",
             "SPEED_TOOLTIP": "Snelheid: {{speed}}",
+            "SUBTITLES_TOOLTIP": "Ondertiteling: {{subtitles}}",
             "ASPECT_RATIO": "Beeldverhouding",
             "ASPECT_TOOLTIP": "Beeldverhouding: {{aspect}}",
             "ASPECT_DEFAULT": "Standaard",

apps/web/src/assets/i18n/pl.json

@@ -620,6 +620,7 @@
             "AUDIO_TRACKS": "Ścieżki audio",
             "SUBTITLES": "Napisy",
             "SUBTITLES_OFF": "Wyłączone",
+            "SUBTITLES_ON": "Włączone",
             "QUALITY": "Jakość",
             "QUALITY_AUTO": "Automatycznie",
             "TRACK_DEFAULT": "Domyślna",
@@ -627,6 +628,7 @@
             "SUBTITLE_TRACK_FALLBACK": "Napisy {{index}}",
             "PLAYBACK_SPEED": "Prędkość odtwarzania",
             "SPEED_TOOLTIP": "Prędkość: {{speed}}",
+            "SUBTITLES_TOOLTIP": "Napisy: {{subtitles}}",
             "ASPECT_RATIO": "Proporcje obrazu",
             "ASPECT_TOOLTIP": "Proporcje: {{aspect}}",
             "ASPECT_DEFAULT": "Domyślne",

apps/web/src/assets/i18n/pt.json

@@ -620,6 +620,7 @@
             "AUDIO_TRACKS": "Faixas de áudio",
             "SUBTITLES": "Legendas",
             "SUBTITLES_OFF": "Desativadas",
+            "SUBTITLES_ON": "Ativadas",
             "QUALITY": "Qualidade",
             "QUALITY_AUTO": "Automática",
             "TRACK_DEFAULT": "Padrão",
@@ -627,6 +628,7 @@
             "SUBTITLE_TRACK_FALLBACK": "Legenda {{index}}",
             "PLAYBACK_SPEED": "Velocidade de reprodução",
             "SPEED_TOOLTIP": "Velocidade: {{speed}}",
+            "SUBTITLES_TOOLTIP": "Legendas: {{subtitles}}",
             "ASPECT_RATIO": "Proporção da imagem",
             "ASPECT_TOOLTIP": "Proporção: {{aspect}}",
             "ASPECT_DEFAULT": "Padrão",

apps/web/src/assets/i18n/ru.json

@@ -620,6 +620,7 @@
             "AUDIO_TRACKS": "Аудиодорожки",
             "SUBTITLES": "Субтитры",
             "SUBTITLES_OFF": "Выкл.",
+            "SUBTITLES_ON": "Вкл.",
             "QUALITY": "Качество",
             "QUALITY_AUTO": "Авто",
             "TRACK_DEFAULT": "По умолчанию",
@@ -627,6 +628,7 @@
             "SUBTITLE_TRACK_FALLBACK": "Субтитры {{index}}",
             "PLAYBACK_SPEED": "Скорость воспроизведения",
             "SPEED_TOOLTIP": "Скорость: {{speed}}",
+            "SUBTITLES_TOOLTIP": "Субтитры: {{subtitles}}",
             "ASPECT_RATIO": "Соотношение сторон",
             "ASPECT_TOOLTIP": "Соотношение: {{aspect}}",
             "ASPECT_DEFAULT": "По умолчанию",

apps/web/src/assets/i18n/tr.json

@@ -620,6 +620,7 @@
             "AUDIO_TRACKS": "Ses parçaları",
             "SUBTITLES": "Altyazılar",
             "SUBTITLES_OFF": "Kapalı",
+            "SUBTITLES_ON": "Açık",
             "QUALITY": "Kalite",
             "QUALITY_AUTO": "Otomatik",
             "TRACK_DEFAULT": "Varsayılan",
@@ -627,6 +628,7 @@
             "SUBTITLE_TRACK_FALLBACK": "Altyazı {{index}}",
             "PLAYBACK_SPEED": "Oynatma hızı",
             "SPEED_TOOLTIP": "Hız: {{speed}}",
+            "SUBTITLES_TOOLTIP": "Altyazılar: {{subtitles}}",
             "ASPECT_RATIO": "En boy oranı",
             "ASPECT_TOOLTIP": "En boy oranı: {{aspect}}",
             "ASPECT_DEFAULT": "Varsayılan",

apps/web/src/assets/i18n/zh.json

@@ -620,6 +620,7 @@
             "AUDIO_TRACKS": "音轨",
             "SUBTITLES": "字幕",
             "SUBTITLES_OFF": "关闭",
+            "SUBTITLES_ON": "开启",
             "QUALITY": "画质",
             "QUALITY_AUTO": "自动",
             "TRACK_DEFAULT": "默认",
@@ -627,6 +628,7 @@
             "SUBTITLE_TRACK_FALLBACK": "字幕 {{index}}",
             "PLAYBACK_SPEED": "播放速度",
             "SPEED_TOOLTIP": "速度：{{speed}}",
+            "SUBTITLES_TOOLTIP": "字幕：{{subtitles}}",
             "ASPECT_RATIO": "宽高比",
             "ASPECT_TOOLTIP": "宽高比：{{aspect}}",
             "ASPECT_DEFAULT": "默认",

apps/web/src/assets/i18n/zhtw.json

@@ -620,6 +620,7 @@
             "AUDIO_TRACKS": "音軌",
             "SUBTITLES": "字幕",
             "SUBTITLES_OFF": "關閉",
+            "SUBTITLES_ON": "開啟",
             "QUALITY": "畫質",
             "QUALITY_AUTO": "自動",
             "TRACK_DEFAULT": "預設",
@@ -627,6 +628,7 @@
             "SUBTITLE_TRACK_FALLBACK": "字幕 {{index}}",
             "PLAYBACK_SPEED": "播放速度",
             "SPEED_TOOLTIP": "速度：{{speed}}",
+            "SUBTITLES_TOOLTIP": "字幕：{{subtitles}}",
             "ASPECT_RATIO": "長寬比",
             "ASPECT_TOOLTIP": "長寬比：{{aspect}}",
             "ASPECT_DEFAULT": "預設",

docs/architecture/iptvnator-ui-guidelines.md

@@ -91,7 +91,9 @@ themes and fullscreen; frame-copy and built-in shared controls keep their
 light-on-dark overlay palette — the fixed `--pc-*` token set of the shared
 dock (accent blue, cyan, violet, the `--pc-live` / `--pc-danger` reds and a
 light text ramp), never the app theme. The overlay styles in
-`player-controls/` never read a `--mat-sys-*` token.
+`player-controls/` never read a `--mat-sys-*` token, and their keyboard focus
+is a 2px `--pc-text` outline rather than Material's theme-coloured focus layer
+(`player-controls-keyboard.e2e.ts` checks it in both themes).
 
 EPG timeline, list, empty states and programme details use the library-local
 `libs/ui/epg/src/lib/_epg-theme.scss` palette, based on app surfaces, separators,

docs/architecture/player-controls-contract.md

@@ -297,7 +297,8 @@ It owns only transient presentation behavior:
 - `ControlsSettings` — the settings panel's groups, on/modified state and
   open/close transitions (`controls-settings-groups.ts` holds the pure
   group-availability rule);
-- `app-player-settings-panel` — the panel / bottom sheet presentation;
+- `app-player-settings-panel` — the panel / bottom sheet presentation,
+  whose radio groups use `settings-radio-group.directive.ts`;
 - `ControlsUpNext` and `app-player-up-next-card` — the "Up next" card's
   gate and presentation; and
 - `controls-view-model.ts` — derived display state.
@@ -346,7 +347,11 @@ app's `--app-selection-color` is a different blue that would fight the video.
   measured below 3:1 against the lighter fills.
 - **Icon buttons** are 40px with a 12px radius (32px / 9px compact) through
   Material's `--mat-icon-button-*` tokens; their hover is a flat
-  `rgba(255,255,255,.1)` layer.
+  `rgba(255,255,255,.1)` layer. Keyboard focus draws a 2px `--pc-text`
+  outline (`:focus-visible`), and Material's focus state layer is switched
+  off: its colour comes from the app theme, and the light theme's dark layer
+  left no visible focus on video. The settings panel's icon buttons use the
+  same ring, inset by 2px because the panel body clips at its edge.
 
 ### Timeline segments
 
@@ -458,7 +463,10 @@ the panel the moment the last group disappears.
 
 - **Roomy wide dock** (≥ 960px): two **value chips** precede `tune` — subtitles
   (`closed_caption` + the selected track's label, or "Off") and speed
-  (`speed` + `1.25×`). Audio and aspect ratio have no chip: they are
+  (`speed` + `1.25×`). A chip's accessible name and tooltip carry its
+  value (`SUBTITLES_TOOLTIP` "Subtitles: English", `SPEED_TOOLTIP`
+  "Speed: 1.25×"); `tune` has `aria-haspopup="dialog"` and
+  `aria-expanded`. Audio and aspect ratio have no chip: they are
   panel-only. A chip click opens the panel **focused on its group**
   (`settingsFocus`; the group scrolls into view and wears a brief ring);
   right-click or long-press on the subtitle chip toggles subtitles without
@@ -476,12 +484,34 @@ the panel the moment the last group disappears.
   picture and recording stay in the compact dock — the mock shows only
   `tune` + fullscreen there, but those two are engine features a viewer
   needs without opening anything.
-- **Inside**: list groups (audio, subtitles, quality) use `menuitemradio`
+- **Inside**: every choice is a `radio` in a `radiogroup`
-  rows with a check mark and a cyan selection; segmented groups (speed,
+  (`SettingsRadioGroupDirective` / `SettingsRadioDirective`). List groups
-  aspect) use `radio` items with a violet selection, and a selected default
+  (audio, subtitles, quality) are rows with a check mark and a cyan
-  (`1×`, the first aspect preset) stays neutral. The subtitle group carries
+  selection; segmented groups (speed, aspect, subtitle size) have a violet
-  the load-file action and the delay / size / color sections that the
+  selection, and a selected default (`1×`, the first aspect preset) stays
-  popover used to hold (same `player-controls-load-subtitle`,
+  neutral. Each group is one Tab stop — the checked option as the engine
+  reports it, else the first — and arrows, Home and End move focus with a
+  CDK `FocusKeyManager` (wrapping; the horizontal arrows follow `direction`)
+  and check the option they reach, as a native radio group does: the
+  directive clicks it, so the template's handler applies the choice, even
+  onto an option the engine still reports as checked: returning to it must
+  cancel a switch that is still pending. Focus
+  changes also write the roving `tabindex` immediately, because a quick
+  Shift+Tab, Tab can arrive before change detection updates the bindings. The dialog is named by its `h2` title (`aria-labelledby`), each
+  radio group by its `h3` group heading or `h4` subheading, and the delay
+  buttons form a labelled `group`. Headings read `--pc-text-secondary` on
+  `--pc-glass-bg-dense` (`rgba(12,16,23,.86)`), 4.5:1 or more even over a
+  white frame. They wrap with `overflow-wrap: anywhere` and `hyphens: auto`,
+  so one long word (German "Wiedergabegeschwindigkeit") breaks inside the
+  sheet's 84px heading column. Hyphenation needs a `lang` on `<html>`.
+  With subtitles on but no track marked selected yet (the engine can report
+  the switch before the track list), the subtitle chip reads "On"
+  (`SUBTITLES_ON`), never "Off".
+  Every focused option shows the `--pc-text` ring; a selected swatch has a
+  white border with a dark inner gap, and focus adds an outer ring. The
+  subtitle group carries the load-file action (a plain button outside the
+  radio group) and the delay / size / color sections that the popover used
+  to hold (same `player-controls-load-subtitle`,
   `player-controls-subtitle-delay`, `player-controls-subtitle-style` test
   ids). The panel is a `role="dialog"` with `tabindex="-1"`: opened from
   the keyboard (the opener is `:focus-visible`) it takes focus, a pointer
@@ -1639,6 +1669,7 @@ libs/ui/playback/src/lib/player-controls/
 ├── player-settings-panel.component.ts
 ├── player-settings-panel.component.html
 ├── player-settings-panel.component.scss
+├── settings-radio-group.directive.ts
 ├── controls-fullscreen.ts
 ├── controls-menu-selection.ts
 ├── controls-menu-state.ts

libs/ui/playback/src/lib/player-controls/player-controls.component.html

@@ -366,6 +366,16 @@
                     settings.available() && layout.roomy() && !settings.isOpen()
                 ) {
                     @if (settings.groups().subtitles) {
+                        <!-- On with no track marked selected yet (the engine
+                             can report the id before the list) reads "On",
+                             never "Off". The name carries the value
+                             ("Subtitles: English"); the label is the value. -->
+                        @let subtitleValue =
+                            settings.subtitleLabel() ??
+                            ((settings.subtitlesOn()
+                                ? 'EMBEDDED_MPV.PLAYER.SUBTITLES_ON'
+                                : 'EMBEDDED_MPV.PLAYER.SUBTITLES_OFF'
+                            ) | translate);
                         <button
                             type="button"
                             class="player-controls__chip"
@@ -378,10 +388,12 @@
                                 settings.onSubtitleChipContextMenu($event)
                             "
                             [attr.aria-label]="
-                                'EMBEDDED_MPV.PLAYER.SUBTITLES' | translate
+                                'EMBEDDED_MPV.PLAYER.SUBTITLES_TOOLTIP'
+                                    | translate: { subtitles: subtitleValue }
                             "
                             [matTooltip]="
-                                'EMBEDDED_MPV.PLAYER.SUBTITLES' | translate
+                                'EMBEDDED_MPV.PLAYER.SUBTITLES_TOOLTIP'
+                                    | translate: { subtitles: subtitleValue }
                             "
                             matTooltipPosition="above"
                         >
@@ -391,9 +403,7 @@
                                     : 'closed_caption_disabled'
                             }}</mat-icon>
                             <span class="player-controls__chip-label">{{
-                                settings.subtitleLabel() ??
+                                subtitleValue
-                                    ('EMBEDDED_MPV.PLAYER.SUBTITLES_OFF'
-                                        | translate)
                             }}</span>
                         </button>
                     }
@@ -407,7 +417,9 @@
                             data-test-id="player-controls-speed-chip"
                             (click)="settings.open('speed')"
                             [attr.aria-label]="
-                                'EMBEDDED_MPV.PLAYER.PLAYBACK_SPEED' | translate
+                                'EMBEDDED_MPV.PLAYER.SPEED_TOOLTIP'
+                                    | translate
+                                        : { speed: settings.speedLabel() }
                             "
                             [matTooltip]="
                                 'EMBEDDED_MPV.PLAYER.SPEED_TOOLTIP'
@@ -434,6 +446,7 @@
                         "
                         data-test-id="player-controls-settings-button"
                         (click)="settings.toggle()"
+                        aria-haspopup="dialog"
                         [attr.aria-expanded]="settings.isOpen()"
                         [attr.aria-label]="
                             'EMBEDDED_MPV.PLAYER.SETTINGS' | translate

libs/ui/playback/src/lib/player-controls/player-controls.component.scss

@@ -27,6 +27,9 @@
     --pc-track: rgba(255, 255, 255, 0.18);
     --pc-hover: rgba(255, 255, 255, 0.1);
     --pc-glass-bg: rgba(12, 16, 23, 0.72);
+    // The settings panel carries small secondary text over whatever frame is
+    // playing: denser glass keeps it at 4.5:1 even over a white frame.
+    --pc-glass-bg-dense: rgba(12, 16, 23, 0.86);
     --pc-glass-border: rgba(255, 255, 255, 0.09);
     --pc-font-mono:
         ui-monospace, 'SF Mono', 'JetBrains Mono', Menlo, Consolas, monospace;
@@ -493,10 +496,20 @@
     --mat-icon-button-state-layer-size: 40px;
     --mat-icon-button-container-shape: 12px;
     --mat-icon-button-hover-state-layer-opacity: 0;
+    // The ring below is the focus indicator; Material's focus layer would
+    // take its colour from the app theme.
+    --mat-icon-button-focus-state-layer-opacity: 0;
     border-radius: 12px;
     transition: background 120ms ease-out;
 }
 
+// Keyboard focus in the overlay's own text colour, so it shows on video in
+// both app themes. The active `tune` button keeps its accent fill under it.
+:host :is(button[mat-icon-button]:focus-visible) {
+    outline: 2px solid var(--pc-text);
+    outline-offset: 2px;
+}
+
 :host :is(button[mat-icon-button]) mat-icon {
     color: var(--pc-text);
 }

libs/ui/playback/src/lib/player-controls/player-controls.component.settings-panel.spec.ts

@@ -219,7 +219,9 @@ describe('PlayerControlsComponent settings panel', () => {
                 'player-controls__settings--sheet'
             );
             expect(panel?.getAttribute('role')).toBe('dialog');
-            expect(panel?.getAttribute('aria-label')).toBe('Settings');
+            const title = panel?.querySelector('h2');
+            expect(panel?.getAttribute('aria-labelledby')).toBe(title?.id);
+            expect(title?.textContent?.trim()).toBe('Settings');
             expect(
                 query('[data-test-id="player-settings-speed"]')?.classList
             ).toContain('player-settings__group--focused');

libs/ui/playback/src/lib/player-controls/player-controls.component.subtitle-settings.spec.ts

@@ -99,12 +99,14 @@ describe('PlayerControlsComponent subtitle settings', () => {
     });
 
     it('renders the subtitle chip with zero tracks when external loading exists', () => {
-        expect(query('[aria-label="Subtitles"]')).toBeNull();
+        const chip = () =>
+            query('[data-test-id="player-controls-subtitle-chip"]');
+        expect(chip()).toBeNull();
 
         setCapabilities({ externalSubtitles: true });
         fixture.detectChanges();
 
-        expect(query('[aria-label="Subtitles"]')).not.toBeNull();
+        expect(chip()).not.toBeNull();
         openSubtitleMenu();
         // No track list entries: no Off row without a selectable track…
         expect(query('.player-settings__option--selected')).toBeNull();

libs/ui/playback/src/lib/player-controls/player-controls.palette.spec.ts

@@ -30,6 +30,8 @@ const STYLE_SOURCES = new Map(
 const HOST_STYLES = STYLE_SOURCES.get('player-controls.component.scss') ?? '';
 const TIMELINE_STYLES =
     STYLE_SOURCES.get('player-timeline.component.scss') ?? '';
+const SETTINGS_STYLES =
+    STYLE_SOURCES.get('player-settings-panel.component.scss') ?? '';
 
 type Rgb = [number, number, number];
 
@@ -52,6 +54,24 @@ function paletteColor(token: string): { rgb: Rgb; alpha: number } {
     throw new Error(`${token} is not a literal palette colour: "${value}"`);
 }
 
+/** A translucent palette colour composited over an opaque frame. */
+function over(color: { rgb: Rgb; alpha: number }, frame: Rgb): Rgb {
+    return color.rgb.map(
+        (channel, index) =>
+            channel * color.alpha + frame[index] * (1 - color.alpha)
+    ) as Rgb;
+}
+
+/** The declarations of the first rule whose selector list is exactly `selector`. */
+function ruleBody(source: string, selector: string): string {
+    const escaped = selector.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+    return (
+        source.match(
+            new RegExp(`(?:^|[}\\s])${escaped}\\s*\\{([^}]*)\\}`)
+        )?.[1] ?? ''
+    );
+}
+
 function contrastRatio(foreground: Rgb, background: Rgb): number {
     const luminance = (rgb: Rgb): number => {
         const [red, green, blue] = rgb.map((channel) => {
@@ -130,6 +150,67 @@ describe('player controls overlay palette', () => {
         );
     });
 
+    it('keeps the settings headings at 4.5:1 on the panel glass over bright frames', () => {
+        const midGrey: Rgb = [128, 128, 128];
+        const white: Rgb = [255, 255, 255];
+        const glass = paletteColor('--pc-glass-bg-dense');
+        const secondary = paletteColor('--pc-text-secondary').rgb;
+
+        expect(ruleBody(SETTINGS_STYLES, ':host')).toMatch(
+            /background:\s*var\(--pc-glass-bg-dense\b/
+        );
+        expect(
+            ruleBody(
+                SETTINGS_STYLES,
+                '.player-settings__heading,\n.player-settings__subheading'
+            )
+        ).toMatch(/color:\s*var\(--pc-text-secondary\b/);
+        expect(SETTINGS_STYLES).not.toMatch(
+            /__(sub)?heading\s*\{[^}]*--pc-text-tertiary/
+        );
+        for (const frame of [midGrey, white]) {
+            expect(
+                contrastRatio(secondary, over(glass, frame))
+            ).toBeGreaterThanOrEqual(4.5);
+        }
+        // The tertiary step the headings used to read failed on mid-grey.
+        expect(
+            contrastRatio(
+                paletteColor('--pc-text-tertiary').rgb,
+                over(paletteColor('--pc-glass-bg'), midGrey)
+            )
+        ).toBeLessThan(4.5);
+    });
+
+    it('draws keyboard focus on icon buttons in the overlay text colour', () => {
+        const ring = /outline:\s*2px solid var\(--pc-text[,)]/;
+        for (const source of [HOST_STYLES, SETTINGS_STYLES]) {
+            expect(
+                ruleBody(
+                    source,
+                    ':host :is(button[mat-icon-button]:focus-visible)'
+                )
+            ).toMatch(ring);
+            // Material's focus layer takes the app theme's colour.
+            expect(
+                ruleBody(source, ':host :is(button[mat-icon-button])')
+            ).toMatch(/--mat-icon-button-focus-state-layer-opacity:\s*0;/);
+        }
+    });
+
+    it('tells a focused selected swatch from one that is only selected', () => {
+        const selected = ruleBody(
+            SETTINGS_STYLES,
+            '.player-settings__swatch--selected'
+        );
+        const focused = ruleBody(
+            SETTINGS_STYLES,
+            '.player-settings__swatch:focus-visible'
+        );
+        expect(selected).not.toMatch(/outline/);
+        expect(focused).toMatch(/outline:\s*2px solid var\(--pc-text[,)]/);
+    });
+
     it('keeps the palette reds readable on video', () => {
         const white: Rgb = [255, 255, 255];
         const glass = paletteColor('--pc-glass-bg');

libs/ui/playback/src/lib/player-controls/player-settings-panel.a11y.spec.ts

@@ -0,0 +1,355 @@
+import { WritableSignal, signal } from '@angular/core';
+import { ComponentFixture, TestBed } from '@angular/core/testing';
+import { TranslateModule, TranslateService } from '@ngx-translate/core';
+import {
+    DEFAULT_PLAYER_CAPABILITIES,
+    createEmptyControlsState,
+} from './player-controls-defaults';
+import { PlayerControlsComponent } from './player-controls.component';
+import type {
+    PlayerControlsCapabilities,
+    PlayerControlsCommands,
+    PlayerControlsState,
+    PlayerController,
+} from './player-controls.model';
+
+function createFakeController() {
+    const capabilities: WritableSignal<PlayerControlsCapabilities> = signal({
+        ...DEFAULT_PLAYER_CAPABILITIES,
+        audioTracks: true,
+        subtitles: true,
+        externalSubtitles: true,
+        subtitleDelay: true,
+        subtitleStyle: true,
+        qualityLevels: true,
+        playbackSpeed: true,
+        aspectRatio: true,
+    });
+    const state: WritableSignal<PlayerControlsState> = signal({
+        ...createEmptyControlsState(),
+        audioTracks: [
+            { id: 1, label: 'English', selected: true },
+            { id: 2, label: 'German', selected: false },
+        ],
+        subtitleTracks: [{ id: 5, label: 'Russian', selected: false }],
+        qualityLevels: [
+            { id: 0, label: '720p', selected: false },
+            { id: 1, label: '1080p', selected: false },
+        ],
+    });
+    const commands = {
+        setAudioTrack: jest.fn(),
+        setSubtitleTrack: jest.fn(),
+        setPlaybackSpeed: jest.fn(),
+        setAspectRatio: jest.fn(),
+    } as unknown as jest.Mocked<PlayerControlsCommands>;
+    const controller: PlayerController = { capabilities, state, commands };
+    return { controller, capabilities, state, commands };
+}
+
+const KEY_CODES: Record<string, number> = {
+    ArrowLeft: 37,
+    ArrowUp: 38,
+    ArrowRight: 39,
+    ArrowDown: 40,
+    Home: 36,
+    End: 35,
+};
+
+/** A real key press carries its legacy `keyCode`, which CDK key managers read. */
+function press(target: HTMLElement, key: string): KeyboardEvent {
+    const event = new KeyboardEvent('keydown', {
+        key,
+        bubbles: true,
+        cancelable: true,
+    });
+    Object.defineProperty(event, 'keyCode', { value: KEY_CODES[key] });
+    target.dispatchEvent(event);
+    return event;
+}
+
+/**
+ * The settings panel as assistive technology and the keyboard meet it: a
+ * dialog named by its heading, radio groups named by theirs with one Tab
+ * stop each, arrow keys that move focus without applying, and dock chips
+ * whose names carry their values.
+ */
+describe('PlayerSettingsPanelComponent accessibility', () => {
+    const originalResizeObserver = globalThis.ResizeObserver;
+    let fixture: ComponentFixture<PlayerControlsComponent>;
+    let component: PlayerControlsComponent;
+    let fake: ReturnType<typeof createFakeController>;
+
+    const query = (selector: string) =>
+        fixture.nativeElement.querySelector(selector) as HTMLElement | null;
+    const radios = (group: string) =>
+        Array.from(
+            fixture.nativeElement.querySelectorAll(
+                `[data-test-id="player-settings-${group}"] [role="radio"]`
+            ) as NodeListOf<HTMLButtonElement>
+        );
+    // List rows carry a check icon beside their label, segments are text
+    // and colour swatches are named by `aria-label`.
+    const label = (radio: Element) =>
+        radio.getAttribute('aria-label') ??
+        (radio.querySelector('span') ?? radio).textContent?.trim();
+    const tabStops = (group: string) =>
+        radios(group)
+            .filter((radio) => radio.getAttribute('tabindex') === '0')
+            .map(label);
+    const openPanel = () => {
+        component.settings.open();
+        fixture.detectChanges();
+    };
+
+    beforeEach(async () => {
+        globalThis.ResizeObserver = class {
+            observe(): void {
+                /* noop */
+            }
+            unobserve(): void {
+                /* noop */
+            }
+            disconnect(): void {
+                /* noop */
+            }
+        } as unknown as typeof ResizeObserver;
+        localStorage.removeItem('volume');
+        await TestBed.configureTestingModule({
+            imports: [PlayerControlsComponent, TranslateModule.forRoot()],
+        }).compileComponents();
+
+        const translate = TestBed.inject(TranslateService);
+        translate.setTranslation('en', {
+            EMBEDDED_MPV: {
+                PLAYER: {
+                    SETTINGS: 'Settings',
+                    AUDIO_TRACKS: 'Audio tracks',
+                    SUBTITLES: 'Subtitles',
+                    SUBTITLES_OFF: 'Off',
+                    SUBTITLES_ON: 'On',
+                    SUBTITLES_TOOLTIP: 'Subtitles: {{subtitles}}',
+                    SUBTITLE_DELAY: 'Subtitle delay',
+                    SUBTITLE_SIZE: 'Subtitle size',
+                    SUBTITLE_COLOR: 'Subtitle color',
+                    SUBTITLE_COLOR_DEFAULT: 'Default',
+                    QUALITY: 'Quality',
+                    QUALITY_AUTO: 'Auto',
+                    PLAYBACK_SPEED: 'Playback speed',
+                    SPEED_TOOLTIP: 'Speed: {{speed}}',
+                    ASPECT_RATIO: 'Aspect ratio',
+                    ASPECT_DEFAULT: 'Default',
+                },
+            },
+        });
+        translate.use('en');
+
+        fake = createFakeController();
+        fixture = TestBed.createComponent(PlayerControlsComponent);
+        component = fixture.componentInstance;
+        fixture.componentRef.setInput('controller', fake.controller);
+        fixture.detectChanges();
+        document.body.appendChild(fixture.nativeElement);
+    });
+
+    afterEach(() => {
+        fixture.nativeElement.remove();
+        fixture.destroy();
+        globalThis.ResizeObserver = originalResizeObserver;
+    });
+
+    it('names the dialog and every radio group by a real heading', () => {
+        openPanel();
+        const panel = query('[data-test-id="player-controls-settings-panel"]');
+        const title = panel?.querySelector('h2');
+        expect(panel?.getAttribute('aria-labelledby')).toBe(title?.id);
+        expect(title?.textContent?.trim()).toBe('Settings');
+
+        const groups = Array.from(
+            panel?.querySelectorAll('[role="radiogroup"]') ?? []
+        ).map((group) => {
+            const heading = document.getElementById(
+                group.getAttribute('aria-labelledby') ?? ''
+            );
+            return `${heading?.tagName} ${heading?.textContent?.trim()}`;
+        });
+        expect(groups).toEqual([
+            'H3 Audio tracks',
+            'H3 Subtitles',
+            'H4 Subtitle size',
+            'H4 Subtitle color',
+            'H3 Quality',
+            'H3 Playback speed',
+            'H3 Aspect ratio',
+        ]);
+        expect(
+            document.getElementById(
+                query(
+                    '[data-test-id="player-controls-subtitle-delay"] [role="group"]'
+                )?.getAttribute('aria-labelledby') ?? ''
+            )?.textContent
+        ).toContain('Subtitle delay');
+    });
+
+    it('offers radios only, with the load-file action outside the group', () => {
+        openPanel();
+        const panel = query(
+            '[data-test-id="player-controls-settings-panel"]'
+        ) as HTMLElement;
+
+        expect(panel.querySelectorAll('[role^="menuitem"]')).toHaveLength(0);
+        const radioParents = Array.from(
+            panel.querySelectorAll('[role="radio"]')
+        ).map((radio) => radio.parentElement?.getAttribute('role'));
+        expect(radioParents.length).toBeGreaterThan(0);
+        expect(new Set(radioParents)).toEqual(new Set(['radiogroup']));
+
+        const load = query('[data-test-id="player-controls-load-subtitle"]');
+        expect(load?.hasAttribute('role')).toBe(false);
+        expect(load?.closest('[role="radiogroup"]')).toBeNull();
+    });
+
+    it('gives each group one Tab stop on its checked option, else the first', () => {
+        fake.state.update((state) => ({ ...state, playbackSpeed: 1.1 }));
+        openPanel();
+
+        expect(tabStops('audio')).toEqual(['English']);
+        // Tracks, then the subtitle size and colour groups of the section.
+        expect(tabStops('subtitles')).toEqual(['Off', '100%', 'Default']);
+        expect(tabStops('quality')).toEqual(['Auto']);
+        // No preset matches 1.1×: the first option keeps the group reachable.
+        expect(tabStops('speed')).toEqual(['0.5×']);
+        expect(tabStops('aspect')).toEqual(['Default']);
+    });
+
+    it('moves focus with the arrow keys, Home and End and checks the option reached', () => {
+        openPanel();
+        const checked = radios('speed').find(
+            (radio) => radio.getAttribute('aria-checked') === 'true'
+        ) as HTMLButtonElement;
+        checked.focus();
+        expect(checked.textContent?.trim()).toBe('1×');
+
+        expect(press(checked, 'ArrowRight').defaultPrevented).toBe(true);
+        fixture.detectChanges();
+        expect(document.activeElement?.textContent?.trim()).toBe('1.25×');
+        expect(tabStops('speed')).toEqual(['1.25×']);
+
+        // The ends wrap, as in a native radio group.
+        const reached = [
+            'ArrowDown',
+            'ArrowUp',
+            'ArrowLeft',
+            'End',
+            'ArrowRight',
+            'ArrowLeft',
+            'Home',
+        ].map((key) => {
+            press(document.activeElement as HTMLElement, key);
+            return document.activeElement?.textContent?.trim();
+        });
+        expect(reached).toEqual([
+            '1.5×',
+            '1.25×',
+            '1×',
+            '2×',
+            '0.5×',
+            '2×',
+            '0.5×',
+        ]);
+        // Every move applies its option, 1× included: the (fake) engine
+        // still reports 1× checked, but 1.25× is the pending request.
+        expect(
+            fake.commands.setPlaybackSpeed.mock.calls.map(([speed]) => speed)
+        ).toEqual([1.25, 1.5, 1.25, 1, 2, 0.5, 2, 0.5]);
+    });
+
+    it('keeps arrow keys inside their own group', () => {
+        openPanel();
+        const [english, german] = radios('audio');
+        english.focus();
+        press(english, 'ArrowDown');
+        expect(document.activeElement).toBe(german);
+        press(german, 'ArrowDown');
+        expect(document.activeElement).toBe(english);
+        // Returning before the engine confirms the first switch applies
+        // English again; otherwise the pending switch would win.
+        expect(fake.commands.setAudioTrack.mock.calls).toEqual([[2], [1]]);
+        expect(fake.commands.setPlaybackSpeed).not.toHaveBeenCalled();
+    });
+
+    it('hands the Tab stop back to the reported checked option when focus leaves', () => {
+        // The fake engine never confirms the switch the arrow key requested,
+        // so English stays the checked track.
+        openPanel();
+        const [english, german] = radios('audio');
+        english.focus();
+        press(english, 'ArrowDown');
+        fixture.detectChanges();
+        expect(tabStops('audio')).toEqual(['German']);
+        expect(german.tabIndex).toBe(0);
+
+        query('[data-test-id="player-settings-close"]')?.focus();
+        fixture.detectChanges();
+        expect(tabStops('audio')).toEqual(['English']);
+    });
+
+    it('reverses the horizontal arrows in a right-to-left layout', () => {
+        openPanel();
+        const speed = radios('speed');
+        (speed[0].parentElement as HTMLElement).style.direction = 'rtl';
+        speed[2].focus();
+
+        press(speed[2], 'ArrowLeft');
+        expect(document.activeElement).toBe(speed[3]);
+        press(speed[3], 'ArrowRight');
+        expect(document.activeElement).toBe(speed[2]);
+    });
+
+    it('names the chips with their current values', () => {
+        const subtitleChip = () =>
+            query('[data-test-id="player-controls-subtitle-chip"]');
+        const speedChip = () =>
+            query('[data-test-id="player-controls-speed-chip"]');
+        expect(subtitleChip()?.getAttribute('aria-label')).toBe(
+            'Subtitles: Off'
+        );
+        expect(speedChip()?.getAttribute('aria-label')).toBe('Speed: 1×');
+
+        fake.state.update((state) => ({
+            ...state,
+            subtitleTracks: [{ id: 5, label: 'Russian', selected: true }],
+            subtitlesEnabled: true,
+            playbackSpeed: 1.25,
+        }));
+        fixture.detectChanges();
+
+        expect(subtitleChip()?.getAttribute('aria-label')).toBe(
+            'Subtitles: Russian'
+        );
+        expect(speedChip()?.getAttribute('aria-label')).toBe('Speed: 1.25×');
+    });
+
+    it('names the subtitle chip "On" while no enabled track is marked selected', () => {
+        // The engine can report subtitles on before the track list marks the
+        // selected track; the chip must not claim they are off.
+        fake.state.update((state) => ({
+            ...state,
+            subtitleTracks: [{ id: 5, label: 'Russian', selected: false }],
+            subtitlesEnabled: true,
+        }));
+        fixture.detectChanges();
+
+        const chip = query('[data-test-id="player-controls-subtitle-chip"]');
+        expect(chip?.getAttribute('aria-label')).toBe('Subtitles: On');
+        expect(
+            chip?.querySelector('.player-controls__chip-label')?.textContent
+        ).toContain('On');
+    });
+
+    it('announces that the tune button opens a dialog', () => {
+        const tune = query('[data-test-id="player-controls-settings-button"]');
+        expect(tune?.getAttribute('aria-haspopup')).toBe('dialog');
+        expect(tune?.getAttribute('aria-expanded')).toBe('false');
+    });
+});

libs/ui/playback/src/lib/player-controls/player-settings-panel.component.html

@@ -2,7 +2,9 @@
     <div class="player-settings__grip" aria-hidden="true"></div>
 }
 <div class="player-settings__header">
-    <div class="player-settings__title">{{ title() }}</div>
+    <h2 class="player-settings__title" [id]="headingId('title')">
+        {{ title() }}
+    </h2>
     <button
         mat-icon-button
         type="button"
@@ -24,29 +26,26 @@
             data-group="audio"
             data-test-id="player-settings-audio"
         >
-            <div class="player-settings__heading">
+            <h3 class="player-settings__heading" [id]="headingId('audio')">
                 <span
                     class="player-settings__dot player-settings__dot--cyan"
                     aria-hidden="true"
                 ></span>
                 {{ 'EMBEDDED_MPV.PLAYER.AUDIO_TRACKS' | translate }}
-            </div>
+            </h3>
             <div
                 class="player-settings__options"
-                role="group"
+                appSettingsRadioGroup
-                [attr.aria-label]="
+                [attr.aria-labelledby]="headingId('audio')"
-                    'EMBEDDED_MPV.PLAYER.AUDIO_TRACKS' | translate
-                "
             >
                 @for (track of state().audioTracks; track track.id) {
                     <button
                         type="button"
-                        role="menuitemradio"
                         class="player-settings__option"
+                        [appSettingsRadio]="track.selected"
                         [class.player-settings__option--selected]="
                             track.selected
                         "
-                        [attr.aria-checked]="track.selected"
                         (click)="selection().audioTrack(track.id)"
                     >
                         <span>{{ track.label }}</span>
@@ -66,82 +65,86 @@
             data-group="subtitles"
             data-test-id="player-settings-subtitles"
         >
-            <div class="player-settings__heading">
+            <h3 class="player-settings__heading" [id]="headingId('subtitles')">
                 <span
                     class="player-settings__dot player-settings__dot--cyan"
                     aria-hidden="true"
                 ></span>
                 {{ 'EMBEDDED_MPV.PLAYER.SUBTITLES' | translate }}
-            </div>
+            </h3>
-            <div
+            @if (state().subtitleTracks.length > 0) {
-                class="player-settings__options"
+                <div
-                role="group"
+                    class="player-settings__options"
-                [attr.aria-label]="'EMBEDDED_MPV.PLAYER.SUBTITLES' | translate"
+                    appSettingsRadioGroup
-            >
+                    [attr.aria-labelledby]="headingId('subtitles')"
-                @if (
+                >
-                    capabilities().subtitles &&
+                    @if (capabilities().subtitles) {
-                    state().subtitleTracks.length > 0
+                        <button
-                ) {
+                            type="button"
-                    <button
+                            class="player-settings__option player-settings__option--default"
-                        type="button"
+                            [appSettingsRadio]="!state().subtitlesEnabled"
-                        role="menuitemradio"
+                            [class.player-settings__option--selected]="
-                        class="player-settings__option player-settings__option--default"
+                                !state().subtitlesEnabled
-                        [class.player-settings__option--selected]="
+                            "
-                            !state().subtitlesEnabled
+                            (click)="selection().subtitleTrack(-1)"
-                        "
+                        >
-                        [attr.aria-checked]="!state().subtitlesEnabled"
+                            <span>{{
-                        (click)="selection().subtitleTrack(-1)"
+                                'EMBEDDED_MPV.PLAYER.SUBTITLES_OFF' | translate
-                    >
+                            }}</span>
-                        <span>{{
+                            @if (!state().subtitlesEnabled) {
-                            'EMBEDDED_MPV.PLAYER.SUBTITLES_OFF' | translate
+                                <mat-icon>check</mat-icon>
-                        }}</span>
+                            }
-                        @if (!state().subtitlesEnabled) {
+                        </button>
-                            <mat-icon>check</mat-icon>
+                    }
-                        }
+                    @for (track of state().subtitleTracks; track track.id) {
-                    </button>
+                        <button
-                }
+                            type="button"
-                @for (track of state().subtitleTracks; track track.id) {
+                            class="player-settings__option"
-                    <button
+                            [appSettingsRadio]="track.selected"
-                        type="button"
+                            [class.player-settings__option--selected]="
-                        role="menuitemradio"
+                                track.selected
-                        class="player-settings__option"
+                            "
-                        [class.player-settings__option--selected]="
+                            (click)="selection().subtitleTrack(track.id)"
-                            track.selected
+                        >
-                        "
+                            <span>{{ track.label }}</span>
-                        [attr.aria-checked]="track.selected"
+                            @if (track.selected) {
-                        (click)="selection().subtitleTrack(track.id)"
+                                <mat-icon>check</mat-icon>
-                    >
+                            }
-                        <span>{{ track.label }}</span>
+                        </button>
-                        @if (track.selected) {
+                    }
-                            <mat-icon>check</mat-icon>
+                </div>
-                        }
+            }
-                    </button>
+            @if (capabilities().externalSubtitles) {
-                }
+                <!-- An action, not a choice: kept out of the radio group. -->
-                @if (capabilities().externalSubtitles) {
+                <button
-                    <button
+                    type="button"
-                        type="button"
+                    class="player-settings__option player-settings__option--action"
-                        role="menuitem"
+                    data-test-id="player-controls-load-subtitle"
-                        class="player-settings__option player-settings__option--action"
+                    (click)="loadExternalSubtitle()"
-                        data-test-id="player-controls-load-subtitle"
+                >
-                        (click)="loadExternalSubtitle()"
+                    <span>{{
-                    >
+                        'EMBEDDED_MPV.PLAYER.LOAD_SUBTITLE_FILE' | translate
-                        <span>{{
+                    }}</span>
-                            'EMBEDDED_MPV.PLAYER.LOAD_SUBTITLE_FILE' | translate
+                    <mat-icon>upload_file</mat-icon>
-                        }}</span>
+                </button>
-                        <mat-icon>upload_file</mat-icon>
+            }
-                    </button>
-                }
-            </div>
 
             @if (capabilities().subtitleDelay) {
                 <div
                     class="player-settings__subsection"
                     data-test-id="player-controls-subtitle-delay"
                 >
-                    <div class="player-settings__subheading">
+                    <h4
+                        class="player-settings__subheading"
+                        [id]="headingId('subtitle-delay')"
+                    >
                         {{ 'EMBEDDED_MPV.PLAYER.SUBTITLE_DELAY' | translate }}
-                    </div>
+                    </h4>
-                    <div class="player-settings__delay-row">
+                    <div
+                        class="player-settings__delay-row"
+                        role="group"
+                        [attr.aria-labelledby]="headingId('subtitle-delay')"
+                    >
                         <button
                             mat-icon-button
                             type="button"
@@ -212,15 +215,16 @@
                     class="player-settings__subsection"
                     data-test-id="player-controls-subtitle-style"
                 >
-                    <div class="player-settings__subheading">
+                    <h4
+                        class="player-settings__subheading"
+                        [id]="headingId('subtitle-size')"
+                    >
                         {{ 'EMBEDDED_MPV.PLAYER.SUBTITLE_SIZE' | translate }}
-                    </div>
+                    </h4>
                     <div
                         class="player-settings__seg"
-                        role="radiogroup"
+                        appSettingsRadioGroup
-                        [attr.aria-label]="
+                        [attr.aria-labelledby]="headingId('subtitle-size')"
-                            'EMBEDDED_MPV.PLAYER.SUBTITLE_SIZE' | translate
-                        "
                     >
                         @for (
                             preset of subtitleSizePresets;
@@ -228,13 +232,12 @@
                         ) {
                             <button
                                 type="button"
-                                role="radio"
                                 class="player-settings__seg-item"
-                                [class.player-settings__seg-item--selected]="
+                                [appSettingsRadio]="
                                     preset.value ===
                                     state().subtitleStyle.sizePercent
                                 "
-                                [attr.aria-checked]="
+                                [class.player-settings__seg-item--selected]="
                                     preset.value ===
                                     state().subtitleStyle.sizePercent
                                 "
@@ -246,15 +249,16 @@
                             </button>
                         }
                     </div>
-                    <div class="player-settings__subheading">
+                    <h4
+                        class="player-settings__subheading"
+                        [id]="headingId('subtitle-color')"
+                    >
                         {{ 'EMBEDDED_MPV.PLAYER.SUBTITLE_COLOR' | translate }}
-                    </div>
+                    </h4>
                     <div
                         class="player-settings__swatches"
-                        role="radiogroup"
+                        appSettingsRadioGroup
-                        [attr.aria-label]="
+                        [attr.aria-labelledby]="headingId('subtitle-color')"
-                            'EMBEDDED_MPV.PLAYER.SUBTITLE_COLOR' | translate
-                        "
                     >
                         @for (
                             preset of subtitleColorPresets;
@@ -262,8 +266,10 @@
                         ) {
                             <button
                                 type="button"
-                                role="radio"
                                 class="player-settings__swatch"
+                                [appSettingsRadio]="
+                                    preset.value === state().subtitleStyle.color
+                                "
                                 [class.player-settings__swatch--default]="
                                     preset.value === null
                                 "
@@ -271,9 +277,6 @@
                                     preset.value === state().subtitleStyle.color
                                 "
                                 [style.--swatch-color]="preset.value"
-                                [attr.aria-checked]="
-                                    preset.value === state().subtitleStyle.color
-                                "
                                 [attr.aria-label]="preset.label | translate"
                                 [matTooltip]="preset.label | translate"
                                 (click)="
@@ -294,26 +297,25 @@
             data-group="quality"
             data-test-id="player-settings-quality"
         >
-            <div class="player-settings__heading">
+            <h3 class="player-settings__heading" [id]="headingId('quality')">
                 <span
                     class="player-settings__dot player-settings__dot--violet"
                     aria-hidden="true"
                 ></span>
                 {{ 'EMBEDDED_MPV.PLAYER.QUALITY' | translate }}
-            </div>
+            </h3>
             <div
                 class="player-settings__options"
-                role="group"
+                appSettingsRadioGroup
-                [attr.aria-label]="'EMBEDDED_MPV.PLAYER.QUALITY' | translate"
+                [attr.aria-labelledby]="headingId('quality')"
             >
                 <button
                     type="button"
-                    role="menuitemradio"
                     class="player-settings__option player-settings__option--default"
+                    [appSettingsRadio]="state().qualityAutoEnabled"
                     [class.player-settings__option--selected]="
                         state().qualityAutoEnabled
                     "
-                    [attr.aria-checked]="state().qualityAutoEnabled"
                     (click)="selection().qualityLevel(-1)"
                 >
                     <span>{{
@@ -326,12 +328,11 @@
                 @for (level of state().qualityLevels; track level.id) {
                     <button
                         type="button"
-                        role="menuitemradio"
                         class="player-settings__option"
+                        [appSettingsRadio]="level.selected"
                         [class.player-settings__option--selected]="
                             level.selected
                         "
-                        [attr.aria-checked]="level.selected"
                         (click)="selection().qualityLevel(level.id)"
                     >
                         <span>{{ level.label }}</span>
@@ -351,34 +352,31 @@
             data-group="speed"
             data-test-id="player-settings-speed"
         >
-            <div class="player-settings__heading">
+            <h3 class="player-settings__heading" [id]="headingId('speed')">
                 <span
                     class="player-settings__dot player-settings__dot--violet"
                     aria-hidden="true"
                 ></span>
                 {{ 'EMBEDDED_MPV.PLAYER.PLAYBACK_SPEED' | translate }}
-            </div>
+            </h3>
             <div
                 class="player-settings__seg"
-                role="radiogroup"
+                appSettingsRadioGroup
-                [attr.aria-label]="
+                [attr.aria-labelledby]="headingId('speed')"
-                    'EMBEDDED_MPV.PLAYER.PLAYBACK_SPEED' | translate
-                "
             >
                 @for (preset of state().speedPresets; track preset.value) {
                     <button
                         type="button"
-                        role="radio"
                         class="player-settings__seg-item"
+                        [appSettingsRadio]="
+                            preset.value === state().playbackSpeed
+                        "
                         [class.player-settings__seg-item--default]="
                             preset.value === 1
                         "
                         [class.player-settings__seg-item--selected]="
                             preset.value === state().playbackSpeed
                         "
-                        [attr.aria-checked]="
-                            preset.value === state().playbackSpeed
-                        "
                         (click)="selection().speed(preset.value)"
                     >
                         {{ preset.label }}
@@ -395,34 +393,31 @@
             data-group="aspect"
             data-test-id="player-settings-aspect"
         >
-            <div class="player-settings__heading">
+            <h3 class="player-settings__heading" [id]="headingId('aspect')">
                 <span
                     class="player-settings__dot player-settings__dot--neutral"
                     aria-hidden="true"
                 ></span>
                 {{ 'EMBEDDED_MPV.PLAYER.ASPECT_RATIO' | translate }}
-            </div>
+            </h3>
             <div
                 class="player-settings__seg"
-                role="radiogroup"
+                appSettingsRadioGroup
-                [attr.aria-label]="
+                [attr.aria-labelledby]="headingId('aspect')"
-                    'EMBEDDED_MPV.PLAYER.ASPECT_RATIO' | translate
-                "
             >
                 @for (preset of state().aspectPresets; track preset.value) {
                     <button
                         type="button"
-                        role="radio"
                         class="player-settings__seg-item"
+                        [appSettingsRadio]="
+                            preset.value === state().aspectRatio
+                        "
                         [class.player-settings__seg-item--default]="
                             preset.value === defaultAspect()
                         "
                         [class.player-settings__seg-item--selected]="
                             preset.value === state().aspectRatio
                         "
-                        [attr.aria-checked]="
-                            preset.value === state().aspectRatio
-                        "
                         (click)="selection().aspect(preset.value)"
                     >
                         {{

libs/ui/playback/src/lib/player-controls/player-settings-panel.component.scss

@@ -17,7 +17,7 @@
     box-sizing: border-box;
     padding: 18px 16px;
     color: var(--pc-text, #e7ecf3);
-    background: var(--pc-glass-bg, rgba(12, 16, 23, 0.72));
+    background: var(--pc-glass-bg-dense, rgba(12, 16, 23, 0.86));
     border: 1px solid var(--pc-glass-border, rgba(255, 255, 255, 0.09));
     border-radius: 20px;
     box-shadow: 0 12px 32px rgba(0, 0, 0, 0.45);
@@ -69,7 +69,10 @@
 }
 
 .player-settings__title {
+    margin: 0;
     overflow: hidden;
+    color: inherit;
+    font: inherit;
     font-size: 16px;
     font-weight: 600;
     text-overflow: ellipsis;
@@ -90,6 +93,9 @@
     --mat-icon-button-container-shape: 10px;
     --mat-icon-button-icon-size: 20px;
     --mat-icon-button-hover-state-layer-opacity: 0;
+    // The ring below is the focus indicator; Material's focus layer would
+    // take its colour from the app theme.
+    --mat-icon-button-focus-state-layer-opacity: 0;
     border-radius: 10px;
 }
 
@@ -104,6 +110,13 @@
     background: var(--pc-hover, rgba(255, 255, 255, 0.1));
 }
 
+// Inset like the option rows: the body is the scroll owner and would clip
+// an outer ring on its edge.
+:host :is(button[mat-icon-button]:focus-visible) {
+    outline: 2px solid var(--pc-text, #e7ecf3);
+    outline-offset: -2px;
+}
+
 :host :is(button[mat-icon-button][disabled]),
 :host :is(button[mat-icon-button][disabled]) mat-icon {
     color: var(--pc-text-tertiary, #6b7384);
@@ -147,17 +160,33 @@
     box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.12);
 }
 
+// Small caps text on glass over video: the secondary ramp step keeps it at
+// 4.5:1 or more over a mid-grey frame (the tertiary step measured 4.1:1 over
+// black). One long word ("Wiedergabegeschwindigkeit") breaks instead of
+// running out of the narrow sheet column; `hyphens` needs `<html lang>`.
+.player-settings__heading,
+.player-settings__subheading {
+    margin: 0;
+    color: var(--pc-text-secondary, #9aa3b2);
+    font: inherit;
+    font-size: 11px;
+    font-weight: 600;
+    line-height: 1.3;
+    letter-spacing: 0.08em;
+    text-transform: uppercase;
+    overflow-wrap: anywhere;
+    hyphens: auto;
+}
+
 .player-settings__heading {
     display: flex;
     align-items: center;
     gap: 6px;
     padding: 0 4px 4px;
-    color: var(--pc-text-tertiary, #6b7384);
+}
-    font-size: 11px;
+
-    font-weight: 600;
+.player-settings__heading .player-settings__dot {
-    letter-spacing: 0.08em;
+    flex: 0 0 auto;
-    text-transform: uppercase;
-    white-space: nowrap;
 }
 
 .player-settings__dot {
@@ -300,12 +329,6 @@
 
 .player-settings__subheading {
     padding: 0 4px;
-    color: var(--pc-text-tertiary, #6b7384);
-    font-size: 11px;
-    font-weight: 600;
-    letter-spacing: 0.08em;
-    text-transform: uppercase;
-    white-space: nowrap;
 }
 
 .player-settings__delay-row {
@@ -326,7 +349,9 @@
     flex-wrap: wrap;
     align-items: center;
     gap: 8px;
-    padding: 2px 4px 4px;
+    // Room on every side for the focus ring (2px offset + 2px): the body
+    // scrolls and would clip it at its edge.
+    padding: 4px;
 }
 
 .player-settings__swatch {
@@ -352,10 +377,22 @@
         rgba(255, 255, 255, 0.08);
 }
 
-.player-settings__swatch:hover,
+.player-settings__swatch:hover {
-.player-settings__swatch:focus-visible,
+    border-color: #ffffff;
+}
+
+// Selected: a white ring with a dark gap inside it, which reads on every
+// swatch colour, the white one included.
 .player-settings__swatch--selected {
     border-color: #ffffff;
+    box-shadow: inset 0 0 0 2px rgba(12, 16, 23, 0.9);
+}
+
+// Keyboard focus adds a ring outside the border, so a focused selected
+// swatch looks different from one that is only selected.
+.player-settings__swatch:focus-visible {
+    outline: 2px solid var(--pc-text, #e7ecf3);
+    outline-offset: 2px;
 }
 
 // Sheet density: two-column rows (heading | control) so five groups fit a
@@ -367,15 +404,15 @@
     align-items: start;
 }
 
-// The heading column is narrow: let "Playback speed" wrap onto two lines
+// The heading column is narrow: "Playback speed" wraps onto two lines, and a
-// instead of running under the control.
+// single long word breaks (see the heading rule), instead of running under
+// the control.
 :host(.player-settings--sheet) .player-settings__heading {
     align-items: flex-start;
     min-width: 0;
     padding: 6px 0 0;
     font-size: 10px;
     line-height: 1.25;
-    white-space: normal;
 }
 
 :host(.player-settings--sheet) .player-settings__heading .player-settings__dot {
@@ -410,6 +447,13 @@
     display: none;
 }
 
+// The load-file action sits outside the radio group: keep it in the control
+// column, on the same pill background.
+:host(.player-settings--sheet) .player-settings__option--action {
+    grid-column: 2;
+    background: rgba(255, 255, 255, 0.06);
+}
+
 :host(.player-settings--sheet) .player-settings__seg-item {
     height: 24px;
     font-size: 11.5px;

libs/ui/playback/src/lib/player-controls/player-settings-panel.component.ts

@@ -19,6 +19,10 @@ import type { ControlsSettings } from './controls-settings';
 import type { SettingsGroup } from './controls-settings-groups';
 import type { ControlsSubtitleSettings } from './controls-subtitle-settings';
 import type { PlayerController } from './player-controls.model';
+import {
+    SettingsRadioDirective,
+    SettingsRadioGroupDirective,
+} from './settings-radio-group.directive';
 import {
     SUBTITLE_COLOR_PRESETS,
     SUBTITLE_DELAY_STEP_SECONDS,
@@ -28,6 +32,8 @@ import {
 
 export type PlayerSettingsPanelMode = 'panel' | 'sheet';
 
+let nextPanelId = 0;
+
 /**
  * The settings surface behind the dock's `tune` button: audio, subtitles
  * (tracks, file loading, delay, size and color), quality, speed and aspect
@@ -39,14 +45,21 @@ export type PlayerSettingsPanelMode = 'panel' | 'sheet';
     selector: 'app-player-settings-panel',
     templateUrl: './player-settings-panel.component.html',
     styleUrl: './player-settings-panel.component.scss',
-    imports: [MatButtonModule, MatIconModule, MatTooltipModule, TranslatePipe],
+    imports: [
+        MatButtonModule,
+        MatIconModule,
+        MatTooltipModule,
+        SettingsRadioDirective,
+        SettingsRadioGroupDirective,
+        TranslatePipe,
+    ],
     changeDetection: ChangeDetectionStrategy.OnPush,
     host: {
         class: 'player-settings',
         role: 'dialog',
         tabindex: '-1',
         '[class.player-settings--sheet]': 'mode() === "sheet"',
-        '[attr.aria-label]': 'title()',
+        '[attr.aria-labelledby]': 'headingId("title")',
         '(focusin)': 'focusInside = true',
         '(focusout)': 'onFocusOut($event)',
     },
@@ -54,6 +67,8 @@ export type PlayerSettingsPanelMode = 'panel' | 'sheet';
 export class PlayerSettingsPanelComponent implements OnDestroy {
     private readonly host: HTMLElement =
         inject<ElementRef<HTMLElement>>(ElementRef).nativeElement;
+    /** Several players can be mounted at once: heading ids stay unique. */
+    private readonly idPrefix = `player-settings-${nextPanelId++}`;
     readonly controller = input.required<PlayerController>();
     readonly settings = input.required<ControlsSettings>();
     readonly selection = input.required<ControlsMenuSelection>();
@@ -133,6 +148,11 @@ export class PlayerSettingsPanelComponent implements OnDestroy {
         return this.focusGroup() === group;
     }
 
+    /** The id of a heading that names the dialog or one of its groups. */
+    headingId(name: string): string {
+        return `${this.idPrefix}-${name}`;
+    }
+
     loadExternalSubtitle(): void {
         if (!this.capabilities().externalSubtitles) {
             return;

libs/ui/playback/src/lib/player-controls/settings-radio-group.directive.ts

@@ -0,0 +1,143 @@
+import { FocusKeyManager, type FocusableOption } from '@angular/cdk/a11y';
+import {
+    DestroyRef,
+    Directive,
+    ElementRef,
+    Injector,
+    computed,
+    contentChildren,
+    inject,
+    input,
+    signal,
+} from '@angular/core';
+
+/** One option of a {@link SettingsRadioGroupDirective}: a native button. */
+@Directive({
+    selector: 'button[appSettingsRadio]',
+    host: {
+        role: 'radio',
+        '[attr.aria-checked]': 'checked()',
+        '[attr.tabindex]': 'isTabStop() ? 0 : -1',
+        '(focus)': 'onFocus()',
+    },
+})
+export class SettingsRadioDirective implements FocusableOption {
+    // Not required: a sibling's host binding reads every option's state
+    // before the later options of the same pass have their inputs.
+    readonly checked = input(false, { alias: 'appSettingsRadio' });
+    private readonly group = inject(SettingsRadioGroupDirective);
+    private readonly element: HTMLButtonElement =
+        inject<ElementRef<HTMLButtonElement>>(ElementRef).nativeElement;
+    readonly isTabStop = computed(() => this.group.tabStop() === this);
+
+    get disabled(): boolean {
+        return this.element.disabled;
+    }
+
+    focus(): void {
+        this.element.focus();
+    }
+
+    onFocus(): void {
+        this.group.onOptionFocus(this);
+    }
+
+    /**
+     * Checks the option through its own click handler, as a press would.
+     * Unconditionally: the engine may still report this option checked
+     * while a switch away from it is pending, and returning to it must
+     * cancel that switch.
+     */
+    check(): void {
+        this.element.click();
+    }
+
+    /** Immediate write of what the `tabindex` binding renders next. */
+    setTabStop(isTabStop: boolean): void {
+        this.element.tabIndex = isTabStop ? 0 : -1;
+    }
+}
+
+/**
+ * A radio group in the settings panel (audio, subtitles, quality, speed,
+ * aspect, subtitle size and colour). One option is a Tab stop — the checked
+ * one, or the first when none is — and the arrow keys, Home and End move
+ * focus between the options with a CDK `FocusKeyManager` and check the
+ * option they reach, as a native radio group does. Checking clicks the
+ * option, so the template's handler applies the choice to the player.
+ */
+@Directive({
+    selector: '[appSettingsRadioGroup]',
+    host: {
+        role: 'radiogroup',
+        '(keydown)': 'onKeydown($event)',
+        '(focusout)': 'onFocusOut($event)',
+    },
+})
+export class SettingsRadioGroupDirective {
+    private readonly host: HTMLElement =
+        inject<ElementRef<HTMLElement>>(ElementRef).nativeElement;
+    private readonly options = contentChildren(SettingsRadioDirective, {
+        descendants: true,
+    });
+    /** The option keyboard focus moved to, while it stays in the group. */
+    private readonly focused = signal<SettingsRadioDirective | null>(null);
+    private readonly keyManager = new FocusKeyManager(
+        this.options,
+        inject(Injector)
+    )
+        .withWrap()
+        .withVerticalOrientation()
+        .withHomeAndEnd();
+
+    readonly tabStop = computed(() => {
+        const options = this.options();
+        const focused = this.focused();
+        if (focused && options.includes(focused)) {
+            return focused;
+        }
+        return options.find((option) => option.checked()) ?? options[0];
+    });
+
+    constructor() {
+        inject(DestroyRef).onDestroy(() => this.keyManager.destroy());
+    }
+
+    onOptionFocus(option: SettingsRadioDirective): void {
+        this.focused.set(option);
+        this.keyManager.updateActiveItem(option);
+        this.applyTabStop();
+    }
+
+    onKeydown(event: KeyboardEvent): void {
+        const rtl = getComputedStyle(this.host).direction === 'rtl';
+        this.keyManager.withHorizontalOrientation(rtl ? 'rtl' : 'ltr');
+        const previous = this.keyManager.activeItem;
+        this.keyManager.onKeydown(event);
+        const next = this.keyManager.activeItem;
+        if (next && next !== previous) {
+            next.check();
+        }
+    }
+
+    /** Leaving the group hands the Tab stop back to the checked option. */
+    onFocusOut(event: FocusEvent): void {
+        const next = event.relatedTarget;
+        if (!(next instanceof Node) || !this.host.contains(next)) {
+            this.focused.set(null);
+            this.applyTabStop();
+        }
+    }
+
+    /**
+     * The `tabindex` bindings follow on the next change detection, but a
+     * quick Shift+Tab, Tab can arrive before it and would re-enter the group
+     * on a stale stop, so focus changes also write it straight away.
+     */
+    private applyTabStop(): void {
+        const stop = this.tabStop();
+        for (const option of this.options()) {
+            option.setTabStop(option === stop);
+        }
+    }
+}

package.json

@@ -211,6 +211,7 @@
         "angular-eslint": "22.5.0",
         "astro": "7.2.10",
         "autoprefixer": "10.5.4",
+        "axe-core": "4.13.0",
         "cookie": "2.0.1",
         "cors": "2.8.6",
         "drizzle-kit": "0.31.10",

pnpm-lock.yaml

@@ -371,6 +371,9 @@ importers:
       autoprefixer:
         specifier: 10.5.4
         version: 10.5.4(postcss@8.5.26)
+      axe-core:
+        specifier: 4.13.0
+        version: 4.13.0
       cookie:
         specifier: 2.0.1
         version: 2.0.1
@@ -4901,6 +4904,10 @@ packages:
   aws4@1.13.2:
     resolution: {integrity: sha512-lHe62zvbTB5eEABUVi/AwVh0ZKY9rMMDhmm+eeyuuUQbQ3+J+fONVQOZyj+DdrvD4BY33uYniyRJ4UJIaSKAfw==}
 
+  axe-core@4.13.0:
+    resolution: {integrity: sha512-UzGt8zg7Ny8djbYMhxl2zuEevVa7r2gJjYY5Lwr1xM7+XU2nd6CkIWFTVcCIbAP63vSz71NaVyyuSk9lHKcy0A==}
+    engines: {node: '>=4'}
+
   axios@1.18.1:
     resolution: {integrity: sha512-3nTvFlvpn9Zu/RkHUqtc7/+al4UpRW5az71ap5zccp6e8RAYEzhMTecX8Dz1wWDYrPpUoB1HAQEGEAEvUr7S9g==}
 
@@ -14512,6 +14519,8 @@ snapshots:
 
   aws4@1.13.2: {}
 
+  axe-core@4.13.0: {}
+
   axios@1.18.1(debug@4.4.3(supports-color@7.2.0))(supports-color@7.2.0):
     dependencies:
       follow-redirects: 1.16.0(debug@4.4.3(supports-color@7.2.0))