Intent to Implement: User Timing L3
Liquan (Max) Gu
Contact emails
tdre...@chromium.org, ma...@chromium.org
Design doc/Spec
Summary
User Timing L3 extends the existing User Timing API to enable two new use cases:
Users can pass in custom timestamps to performance.measure and performance.mark, so as to conduct measurement across arbitrary timestamps.
Users can report arbitrary metadata with performance.mark and performance.measure, which provides rich data to analytics via a standardized API.
Motivation
PerformanceObserver provides a consistent way for the browser to expose performance information to web developers and analytics packages in the wild. However, there are times when web developers have performance insights they’d like to process alongside the information the browser provides. Web developers should be able to communicate their own information to performance observers, with rich annotation, enabling their centralized performance monitoring logic and third party analytics tooling to integrate data from the browser with insights from the web page.
Risks
Interoperability and Compatibility
Edge: Public support.
Firefox: No public signals.
Safari: No public signals.
Web developers: No public signals.
Ergonomics
User Timing L3 improves the ergonomics of event timing. There are currently cases where developers serialize a bunch of mark or measure metadata into the entry name, which is hard to use. This makes it much simpler to associate data with marks and measures.
Activation
User Timing L3 extends the existing performance.mark and performance.measure API to allow users to pass in custom timestamps and custom detail objects for both APIs.
Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)?
Yes
Is this feature fully tested by web-platform-tests?
There are existing user-timing wpt tests for the original use cases. We will update the tests to include the new test cases.
Link to entry on the feature dashboard
https://www.chromestatus.com/feature/5149401886490624
crbug/758385
Requesting approval to ship?
Not yet
ma...@chromium.org
Ilya Grigorik
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Yoav Weiss
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