Kam eafdbe008a fix(docs-infra): use a facade for docs-video to fix Firefox embeds ...

Follow-up to #69205. After switching adev's COEP to `credentialless`, the
cross-origin YouTube iframe in `<docs-video>` loads in Chromium and Safari but
not Firefox, whose `credentialless` policy does not extend to nested frames. The
result was a COEP error screen instead of the player.

Render `<docs-video>` as a lightweight thumbnail facade instead of embedding the
iframe directly. The thumbnail is a cross-origin subresource, so it loads under
`credentialless` in every browser. `DocViewer` then upgrades the facade to the
inline player on hydration in browsers that can load the embed (Chromium,
Safari), preserving the previous behavior there. On Firefox the facade stays a
plain link that opens the video on YouTube (with autoplay), which replaces the
error screen.

The thumbnail uses `maxresdefault` and falls back to `hqdefault` when a video
has no max-resolution image.

(cherry picked from commit 43acead06d)

2026-06-15 15:58:04 +00:00

16 KiB

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