Re: [fxtf-drafts] [filters] Backdrop filters should not use BackgroundImage

@grorg This issue definitely needs clarification before we can agree to implementing backdrop-filter in Firefox.

In particular, it needs to be clear how the testcase in should behave.

There are strong parallels to `mix-blend-mode` here: If you have an element with `mix-blend-mode`, blending needs to happen between that element's contents and the element's backdrop. We have an existing definition for what exactly the `mix-blend-mode` backdrop is, and that definition respects isolation. If `backdrop-filter` ends up using a different definition for what the backdrop is, there should be a good justification for the difference.

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Received on Monday, 23 April 2018 21:35:04 UTC