[Webkit-unassigned] [Bug 238965] [ iOS EWS ] css3/background/background-repeat-round-auto2.html is a image failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=238965

--- Comment #12 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
This is cause by using different GPU shaders on different layers.

These shaders are not expected to be exact, and results can differ by 1 per component.

ImageDiff does have built-in tolerance (we don't use --exact), but here three color components are different by 1/255:

difference: exact 0 legacyDistance 0.00656 threshold 0.00392 over 1
133 132  133 132  133 132  255 255

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