[Webkit-unassigned] [Bug 225305] New: PerformanceObserver: buffered flag not working in Paint Timing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=225305

            Bug ID: 225305
           Summary: PerformanceObserver: buffered flag not working in
                    Paint Timing
           Product: WebKit
           Version: Safari 14
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: npm at chromium.org

The PerformanceObserver's buffered flag is implemented and works in, for instance, Resource Timing. But it does not seem to work in Paint Timing.

Test: go to any website, let it load, then run this on the console:
new PerformanceObserver((l)=>console.log(l.getEntries())).observe({type:'paint', buffered: true})

It is expected to show the Paint Timing entry, but it does not work.

See https://github.com/GoogleChrome/web-vitals/pull/139 for more info.

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