https://codepen.io/YusukeNakaya/pen/ZXmJjj Hover it. Nothing happens. Fixed by disabling gfx.webrender.async-scene-build. (I'll file another bug about the clipping issue.)

I can reproduce on mac. It looks like it doesn't update at all, regardless of mouse movement. However I ran it in a profile with TreeStyleTabs installed and as I moused over the tabs in the sidebar (which triggers repaints) I could see the visual effect update... but not correctly. It looked like there were a set of images that it was cycling through, or something. I'll try to attach a video.

Seems to be behaving much better now, but still seems a little jumpy.

I bisected the improvement: ./mach mozregression --find-fix --bad 2018-05-04 --persist ~/Downloads/mozregression/ --pref gfx.webrender.all:true -a https://codepen.io/YusukeNakaya/pen/ZXmJjj produced: https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=754824066ed075a0654efdf1ce381bf3660ed650&tochange=86732dd98df09741b53c037f32620e80b007b6bd So the WR update in bug 1458870 helped somehow.

It strikes me as likely that this is a dupe of https://bugzilla.mozilla.org/show_bug.cgi?id=1455591, since the underlying issue is cached pictures (things like blurs) getting picked up from old frames inappropriately.

Sorry, meant to link https://bugzilla.mozilla.org/show_bug.cgi?id=1458177

Yeah I suspected that might be the case. We can retest once we have builds with that fix.

Latest try push on bug 1466549 does seem to not have this problem, so we can close this once that merges.

Fix range: https://github.com/servo/webrender/compare/8e697f8cb1f1aab2e5f6b9b903eb7191340b10c5...952521658aaf331e7b7382fb18ca1d8b7bfc9dc8 Thanks!