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75 lines
4.4 KiB
Markdown
75 lines
4.4 KiB
Markdown
# PKG-VTT-THUMB-05: browser combination checkpoint
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Baseline: `4fa5c68be9d2d0d60d725c2a87b8d92a4dc8a85a`. Task05 remains doing;
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this checkpoint does not claim physical-device or complete distribution acceptance.
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## Inputs and actual coverage
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The new 5.1.6 core snapshot verifies the registry SHA-512, archive SHA-256 and
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197 archive members. The browser server verifies the actual main entry before
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serving it. This is the source-associated core for usable VTT 1.0.1, not a newly
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invented minimum-supported version. Existing frozen 5.1.7, 5.3.0 and 5.4.0 inputs
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and the current candidate complete the five-core comparison. Npm 5.3.1 was
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previously found absent; 5.3.0 is only an adjacent published stable comparison.
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`vtt-thumbnail-combinations.spec.js` covers:
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- Candidate plugin on all five cores: actual red/blue preview pixels from DOM
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screenshots, real pointer positioning, Chapter progress coexistence, native
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video play/pause, web and native fullscreen, source switching without refetch,
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unchanged control identity and owned UI removal on destroy.
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- Actual published 1.0.2/1.0.3/1.1.0 main bundles on candidate core, and 1.0.1
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on 5.1.6: historical callable/default exports, previews, control identities,
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source switching and a single VTT fetch. The historical compact-arrow input
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requirement is explicit; ordinary-arrow parser failures remain separate tests.
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- Android user-agent profiles with synthetic DOM touch payloads: the actual core
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gesture handlers emit setBar and perform native media seeking, the preview
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follows the drag and its real 500ms timer hides it. This is not trusted OS input
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or physical Android/iOS evidence.
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- Existing native fetch/abort, malformed input/recovery and lifecycle tests remain.
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The current source build is the plugin input. This is not an installed tarball,
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every old legacy bundle, a browser-device farm or the online editor. Those gates
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remain task06/EX-03 and the relevant device/release tasks. No new dependencies,
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runtime code, public types or shippable build artifacts change in this checkpoint.
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## Findings and failed runs
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VTT 1.0.1 registers `thumbnails`. Actual core 5.1.6 creates its built-in control
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only when a thumbnail URL is configured, so the plugin can register normally.
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Core 5.1.7 reserves the control unconditionally. The resulting duplicate-name
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rejection reproduces on 5.1.7, 5.4.0 and candidate cores in all three engines.
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The nine explicit failure assertions are historical evidence, not successful
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old-plugin/new-core acceptance. Preserve the current reserved control; any
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compatibility accommodation must account for its public identity and duplicate
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registration behavior. The pairing is recorded as an open release-review issue.
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The initial 27-case run had nine passes and eighteen failures. Fifteen failures
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came from test-only setBar calls without the event required by newer core hover
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handlers; the tests now use real mouse movement. Three exposed the 1.0.1 collision.
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Legal and incompatible combinations now have distinct explicit assertions.
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The expanded 69-case run passed. Adding native fullscreen then produced fourteen
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passes and one Chromium candidate screenshot timeout. Trace showed actual
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fullscreen ownership followed by a hidden preview at screenshot time; cleanup
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also timed out after the interrupted screenshot. Mouse positioning now first
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uses Playwright's stable/actionable progress hover, then computes the desired
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position, and verifies visible preview/background before screenshot. The final
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69-case run passes. This changes test interaction timing, not player code, and
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does not prove a product fix for every prior timeout. Initial reports are retained;
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no retry, skip, timeout increase or weaker pixel expectation was introduced.
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## Verification and handoff
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`../baselines/vtt-thumbnail-combinations.json` records exact browser versions,
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input identities, passes/failures, screenshots/report fingerprints and Node/CI/lint
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results. Nine passing assertions deliberately confirm historical incompatibility.
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The task remains open for physical-device evidence, final candidate revalidation
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and disposition of the old reserved-name pairing; controlled HTTP fixtures do
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not establish external CDN or every sprite format's behavior.
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The package architecture and environment/browser guides describe actual scope.
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Revert this checkpoint as one unit to remove the new route, frozen core snapshot,
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combination tests and evidence without reverting the earlier VTT implementation.
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Local checkpoint commit only; no push or publication.
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