Combination of paint timing and long tasks can expose precise paint timing

[rniwa]

Combination of paint timing and long tasks can expose precise paint timing

[npm1]

Talked about this on the call. We're gonna remove longtasks from Update the rendering because 1. not implemented 2. it should be tackled by a separate Frame Throughput API instead which cares more about how often frames are updated instead of surfacing 'long frames'. Removing that will fix this issue.

[npm1]

Fixed by whatwg/html#5459

[noamr]

Just ran into this... The Chrome implementation does report longtasks for "update the rendering" as it's done in a separate BeginFrame task. Also requestAnimationFrame callback etc. are inside the "update the rendering" step so removing this means we don't report long tasks generated inside rAF callbacks. Not sure how to go about this.