Contact emails nrosent...@chromium.org, mmo...@chromium.org
Explainer https://github.com/w3c/paint-timing/blob/main/presentation-timestamps.md Specification https://w3c.github.io/paint-timing/#painttimingmixin Summary Expose "paintTime" and "presentationTime" in event timing, element timing, LCP, long animation frames, paint timing. "paintTime" means the time when the rendering phase ended and the browser started the paint phase. "presentationTime" means the time when the "pixels reached the screen", which is somewhat implementation-defined Blink component Blink>PerformanceAPIs Motivation So far the spec defined the paint time as the time after the "rendering update", when the document hands over rendering to the UA. However, in chromium the exposed paint time (in event timing, element timing, LCP and paint-timing) was different - the approximated VSync time from the compositor, which is important in terms of UX. This created confusion and incompatibility This proposal defines both these timestamps, and exposes them in an identical way in all the relevant entries. Initial public proposal https://github.com/w3c/paint-timing/issues/62 TAG review https://github.com/w3ctag/design-reviews/issues/1013 TAG review status Pending Risks Interoperability and Compatibility None Gecko: No signal (https://github.com/mozilla/standards-positions/issues/1110) Firefox folks took part of the WebPerfWG meeting where this was discussed/resolved. WebKit: No signal (https://github.com/WebKit/standards-positions/issues/426) Web developers: No signals Other signals: WebView application risks Does this intent deprecate or change behavior of existing APIs, such that it has potentially high risk for Android WebView-based applications? None Debuggability None Is this feature fully tested by web-platform-tests? No Flag name on about://flags None Finch feature name None Non-finch justification None Requires code in //chrome? False Estimated milestones No milestones specified Link to entry on the Chrome Platform Status https://chromestatus.com/feature/5162859838046208?gate=5141791681282048 This intent message was generated by Chrome Platform Status. -- You received this message because you are subscribed to the Google Groups "blink-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to blink-dev+unsubscr...@chromium.org. To view this discussion visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/67347e70.2b0a0220.3644d.01e9.GAE%40google.com.
