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Add markPaintTime() explainer#1303

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JosephJin0815 wants to merge 1 commit intoMicrosoftEdge:mainfrom
JosephJin0815:user/wangsongj/mark-paint-time
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Add markPaintTime() explainer#1303
JosephJin0815 wants to merge 1 commit intoMicrosoftEdge:mainfrom
JosephJin0815:user/wangsongj/mark-paint-time

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Explainer for performance.markPaintTime() — a new Performance API that lets developers capture paintTime and presentationTime for visual update on demand, extending the timing capability currently available only through browser-detected entries (FP, FCP, LCP, Event Timing, LoAF)

@JosephJin0815 JosephJin0815 marked this pull request as ready for review April 16, 2026 22:37
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