First Paint Timing API

Category: JavaScript
Type: New or changed feature
Status: Enabled by default (Chrome 60)
Intent stage: None

Summary

API to enable developers to measure time for First Paint (FP) & First Contentful Paint (FCP) -- the first key moments in loading that they care about. These moments are added as 'paint' entries in the Performance Timing API.

Standards & signals

Specification: https://w3c.github.io/paint-timing/
Firefox: No signal
Safari: Positive
Web developers: Positive
Tracking bug: https://bugs.chromium.org/p/chromium/issues/detail?id=720055

Docs: https://developer.mozilla.org/en-US/docs/Web/API/PerformancePaintTiming https://developers.google.com/web/updates/2017/07/nic60#paint

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