perf(core): [MOD-03] avoid redundant slider attribute writes

packages/artplayer/ARCHITECTURE.md

@@ -1369,7 +1369,17 @@ entry scope. Native focus updates existing isFocus/isInput flags without emittin
 extra public pointer focus/blur events. `style/accessibility.less` supplies visible
 focus and keyboard control-bar visibility without changing existing class hooks.
 
-`accessibility/slider.ts` owns range keyboard input and ARIA state. Arrow keys use
+`accessibility/slider.ts` owns range keyboard input and ARIA state. Each refresh
+still reads the live range and formats its text, but compares each ARIA value with
+the actual DOM before writing. There is no cross-event value cache: external
+attribute changes/removals are repaired by the next update. This avoids duplicate
+attribute mutations on repeated timeupdate/volumechange without changing media
+events, keyboard writes, range validation or closed-scope behavior. The
+`slider-updates.spec.js` browser check records duplicate-event mutation counts and
+native playback updates; optional ARTPLAYER_SLIDER_BASELINE supplies a prechange
+artifact for three alternating paired groups. Synthetic paused-event timings are
+diagnostic, not overall playback or initialization performance acceptance.
+Arrow keys use
 the configured step, PageUp/PageDown use ten steps, and Home/End select endpoints.
 Unavailable or non-finite ranges remain focusable but disabled; their navigation
 keys cannot fall through to player shortcuts. Values and accessible text follow

packages/artplayer/dist/artplayer.js

@@ -67,4 +67,4 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
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+!function(t,e){"object"===typeof exports&&"undefined"!==typeof module?module.exports=e():"function"==typeof define&&define.amd?(t.Artplayer=e(),define(function(){return t.Artplayer})):(t="undefined"!==typeof globalThis?globalThis:t||self).Artplayer=e()}(this,function(){"use strict";function t(t){return t&&t.__esModule&&Object.prototype.hasOwnProperty.call(t,"default")?t.default:t}var e,r={exports:{}};var n=(e||(e=1,r.exports=function(){function t(e){return(t="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(t){return typeof t}:function(t){return t&&"function"==typeof Symbol&&t.constructor===Symbol&&t!==Symbol.prototype?"symbol":typeof t})(e)}var e=Object.prototype.toString,r=function(r){if(void 0===r)return"undefined";if(null===r)return"null";var 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packages/artplayer/dist/artplayer.legacy.js

@@ -67,4 +67,4 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
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packages/artplayer/dist/artplayer.mjs

@@ -2268,6 +2268,10 @@ function installProgressInteractions(art, $control) {
   }
 }
 const directions = /* @__PURE__ */ new Map([["ArrowRight", 1], ["ArrowUp", 1], ["ArrowLeft", -1], ["ArrowDown", -1], ["PageUp", 10], ["PageDown", -10]]);
+function updateAttribute(element, name, value) {
+  if (element.getAttribute(name) !== value)
+    element.setAttribute(name, value);
+}
 function keyboardSlider(scope, element, label, read, write, orientation = "horizontal") {
   const valid = (range) => [range.min, range.max, range.value, range.step].every(Number.isFinite) && range.max > range.min && range.step > 0;
   const clamp2 = (value, range) => Math.min(range.max, Math.max(range.min, value));
@@ -2277,11 +2281,11 @@ function keyboardSlider(scope, element, label, read, write, orientation = "horiz
     const range = read();
     const enabled = valid(range);
     const value = enabled ? clamp2(range.value, range) : 0;
-    element.setAttribute("aria-disabled", String(!enabled));
-    element.setAttribute("aria-valuemin", String(enabled ? range.min : 0));
-    element.setAttribute("aria-valuemax", String(enabled ? range.max : 0));
-    element.setAttribute("aria-valuenow", String(value));
-    element.setAttribute("aria-valuetext", range.text(value));
+    updateAttribute(element, "aria-disabled", String(!enabled));
+    updateAttribute(element, "aria-valuemin", String(enabled ? range.min : 0));
+    updateAttribute(element, "aria-valuemax", String(enabled ? range.max : 0));
+    updateAttribute(element, "aria-valuenow", String(value));
+    updateAttribute(element, "aria-valuetext", range.text(value));
   };
   if (scope.closed)
     return update;

packages/artplayer/src/accessibility/slider.ts

@@ -12,6 +12,11 @@ interface Range {
 
 const directions = new Map([['ArrowRight', 1], ['ArrowUp', 1], ['ArrowLeft', -1], ['ArrowDown', -1], ['PageUp', 10], ['PageDown', -10]])
 
+function updateAttribute(element: HTMLElement, name: string, value: string): void {
+  if (element.getAttribute(name) !== value)
+    element.setAttribute(name, value)
+}
+
 export function keyboardSlider(scope: ResourceScope, element: HTMLElement, label: string, read: () => Range, write: (value: number) => void, orientation = 'horizontal'): () => void {
   const valid = (range: Range) => [range.min, range.max, range.value, range.step].every(Number.isFinite) && range.max > range.min && range.step > 0
   const clamp = (value: number, range: Range) => Math.min(range.max, Math.max(range.min, value))
@@ -21,11 +26,11 @@ export function keyboardSlider(scope: ResourceScope, element: HTMLElement, label
     const range = read()
     const enabled = valid(range)
     const value = enabled ? clamp(range.value, range) : 0
-    element.setAttribute('aria-disabled', String(!enabled))
-    element.setAttribute('aria-valuemin', String(enabled ? range.min : 0))
-    element.setAttribute('aria-valuemax', String(enabled ? range.max : 0))
-    element.setAttribute('aria-valuenow', String(value))
-    element.setAttribute('aria-valuetext', range.text(value))
+    updateAttribute(element, 'aria-disabled', String(!enabled))
+    updateAttribute(element, 'aria-valuemin', String(enabled ? range.min : 0))
+    updateAttribute(element, 'aria-valuemax', String(enabled ? range.max : 0))
+    updateAttribute(element, 'aria-valuenow', String(value))
+    updateAttribute(element, 'aria-valuetext', range.text(value))
   }
   if (scope.closed)
     return update