[fxtf-drafts] [filter-effects-2] backdrop-filter and the root element (#557)

mattwoodrow has just created a new issue for https://github.com/w3c/fxtf-drafts:

== [filter-effects-2] backdrop-filter and the root element ==
It looks like many of the current WPT tests are capturing the backdrop of a document without a background-color value set anywhere, and expecting to capture white (see [backdrop-filter-basic.html](https://wpt.fyi/results/css/filter-effects/backdrop-filter-basic.html?label=experimental&label=master&aligned))

My understanding is that the default background color is transparent, and it's only the UA-specific 'canvas surface' that would be providing a white background color in this case - https://www.w3.org/TR/css-backgrounds-3/#special-backgrounds.

We also likely want to clarify what happens when there is a background on the root element (or <body>), but it gets propagated to the canvas background. If the root element itself is the backdrop root, then I'd expect the propagated background to not be included in the captured backdrop.



Please view or discuss this issue at https://github.com/w3c/fxtf-drafts/issues/557 using your GitHub account


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Received on Thursday, 21 March 2024 01:10:13 UTC