WPT details: Existing tests: https://wpt.fyi/results/longtask-timing?label=experimental&label=master&aligned This would fix some of them.
Using the LoAF implementation for reporting longtasks is an implementation detail, but it would have the following web-observable impact: - we would stop reporting longtasks for hidden tabs - a few longtask bugs would disappear, resulting in more reported longtasks Note that this would not affect the Lighthouse TBT score, that anyway relies on trace events.