Chrome Version: ToT as of r470101
OS: All

What steps will reproduce the problem?
(1) Run chrome with --enable-slimming-paint-v2
(2) Open the attached test5.html
(3) Hover over the red box.

What is the expected result?
The red box moves upward, while the green box stay stationary.

What happens instead?
Both boxes move upward. Sometimes garbage can be seen.

Weird. Code in PaintArtifactCompositor::CompositedLayerForPendingLayer() should have handled this: https://cs.chromium.org/chromium/src/third_party/WebKit/Source/platform/graphics/compositing/PaintArtifactCompositor.cpp?rcl=beae3258d48f77d48cdb6a094b50505abfaa6008&l=291

And somehow it seems to only affect layers squashed to the root layer.
 

Deleted: test5.html 303 bytes

test5.html 303 bytes View Download