[Webkit-unassigned] [Bug 177232] Gradient on the body rendered incorrectly sometimes

Wed Sep 20 15:01:18 PDT 2017

https://bugs.webkit.org/show_bug.cgi?id=177232

--- Comment #2 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
calculateBackgroundImageGeometry() uses the size of the <body> for positioningAreaSize which is used to compute the tile size, which ends up with zero height, but the tileSize gets expanded to one device pixel via:

            return LayoutSize(std::max<LayoutUnit>(1 / deviceScaleFactor, localImageIntrinsicSize.width() * scaleFactor),
                std::max<LayoutUnit>(1 / deviceScaleFactor, localImageIntrinsicSize.height() * scaleFactor));

in RenderBoxModelObject::calculateFillTileSize() which should probably never make 0 bigger.

Other browsers draw no background for this testcase.

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