On macOS, Firefox’s entire window is marked as non-opaque to the compositor and gets fully presented on every event. Chrome has neither issue, probably part of the battery life gap. FF is otherwise quite nice so far though! cc @pcwalton
I dunno, I just heard that Chrome uses full CA at the all hands. Didn’t verify; could be wrong.
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Looks like you’re right. I found this: https://cs.chromium.org/chromium/src/ui/accelerated_widget_mac/README … and the --show-mac-overlay-borders flag. That code also has a bunch of helpful comments about gotchas in the CA API. During my journey I even found hints of the driver bug I encountered earlier (I edited the WR wiki).
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BTW, we’re planning on using Core Animation with WebRender too for scrolling. Would be happy to talk more if you’re interested :)
End of conversation
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