Long Animation Frames style duration

Category: Performance
Type: New or changed feature
Status: Proposed (Chrome Proposed)
Intent stage: None

Summary

Add `styleDuration` and `forcedStyleDuration` information to the Long Animation Frame API, enabling developers to distinguish style and layout times.

Motivation

Currently performance-conscious developers have no way to distinguish their style time from their layout time, making CSS performance issues less actionable than they can be. This feature enables developers to make that distinction.

Standards & signals

Specification: https://github.com/w3c/long-animation-frames/pull/30
Firefox: No signal
Safari: No signal
Web developers: No signals
Tracking bug: https://issues.chromium.org/issues/476826067

Explainers: https://github.com/w3c/long-animation-frames/pull/30#issue-3828859369

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