Created attachment 686394 [details] Video of comment 0 This is a subtle effect, but I've noticed it a few times now. I think I've seen it in content too, so I don't _think_ it's unique to my testcase. In the attached video, my screen is zoomed in on an apptab favicon (Reddit, natch). I move the pointer to trigger a hover style, and then move it away. There should, I think, be exactly 2 states -- hovered or not. [The favicon is normally styled with a small amount of opacity -- to blend in with the gray background -- and when hovered the opacity is removed. The visual effect is that hovered tabs get a "brighter" looking icon.] I'm instead seeing 3 states when moving the mouse away: 1) normal hover (bright) *mouse exit* 2) ??? (for like half a second) 3) normal unhovered (dim) I don't understand what state 2 is. I do wonder if hidpi is involved here somehow (I am on a Retina MBP) -- it's hard to tell from the video, but whereas state 1 and 3 are the usual poor looking 16x16-to-32x32 upscaling, state 2 looks... smoother... like it's it's being blurred at native res.
Original .MOV at https://people.mozilla.com/~dolske/bug816383.mov, it's a bit clearer.
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