[webkit-dev] How to interpret repaint test results?

[Xianzhu (Drew) Wang 王显著]

Hi,

I'm confused with the expected results of some repaint tests, for example,
fast/repaint/fixed-scroll-simple.html. The expected pixel result
(platform/mac/fast/repaint/fixed-scroll-simple-expected.png) is all masked
by dark gray. Does this mean that no part of the page is repainted?
However, the test seems to expect that some part of the page is repainted
so that the red box is fully covered by the green box and is not left on
the page. What did I miss?

Thanks,
Xianzhu
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