Intent to Extend Origin Trial: EventTiming
n...@chromium.org
Contact emails
n...@chromium.org, tdre...@chromium.org
Spec
Link to spec: https://wicg.github.io/event-timing/
Summary
Monitoring event latency today requires an event listener. This precludes measuring event latency early in page load, and adds unnecessary performance overhead. The Event Timing API gives developers insight into the latency of a subset of events triggered by user interaction. In order to capture user pain caused by slow initial interactions, the event timing API includes First Input Delay (FID).
Previous trial results are described at https://groups.google.com/a/chromium.org/forum/#!msg/blink-dev/mGkwLYpHOxM/T7pEAGVJCAAJ
Link to “Intent to Implement” blink-dev discussion
Goals for experimentation
The goal this time is to gain feedback from the a key partner about the FID portion of EventTiming. Since it is exposed in CrUX, we’d like to give developers that are very keen on improving the value to sign up for the origin trial to obtain the data.
Experimental timeline
Current experiment began in M68 and is set to end at the end of M71. We’d like to extend the experiment until the end of M72.
Any risks when the experiment finishes?
No - this is a performance API.
Reason this experiment is being extended
We’d like to extend again because there’s a key partner who hasn’t had a chance to use the trial yet whose data we would value
Ongoing technical constraints
None.
Debuggability
When enabled, FID is exposed via javascript either via PerformanceObserver (requires early registration) or via the performance timeline if it occurs before onload:
// Register observer during onload.
const performanceObserver = new PerformanceObserver …
performanceObserver.observe({entryTypes:['firstInput']});
// Or get it from the buffer.
performance.getEntriesByType(‘firstInput’);
Will this feature be supported on all five Blink platforms supported by Origin Trials (Windows, Mac, Linux, Chrome OS, and Android)?
Yes.
Link to entry on the feature dashboard
https://www.chromestatus.com/feature/5167290693713920
Yoav Weiss
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Chris Harrelson
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