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James XiaoandClaude Sonnet 4.6
1be2a584b4
For video and audio elements, data-start is authored in global (composition-root) time — the same contract used by the render pipeline's discoverMediaFromBrowser, which reads the raw attribute directly. Previously, the visibility loop called resolveStartForElement which adds the nearest ancestor composition's global start on top, causing a double-offset that kept pip-wired media permanently hidden when the host composition did not start at t=0. Example: a pip video with data-start="45.40" inside a host composition that also starts at data-start="45.40" resolved to 90.80, so the video was always hidden during its actual [45.40, 52.46] window. Non-media elements (divs, sections, etc.) continue to use the accumulating resolver because their data-start values are local to their composition. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>