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Re: [fxtf-drafts] [filter-effects-2] Backdrop filters should not use BackgroundImage

From: Mason Freed via GitHub <sysbot+gh@w3.org>
Date: Fri, 09 Nov 2018 21:09:23 +0000
To: public-fxtf-archive@w3.org
Message-ID: <issue_comment.created-437495923-1541797762-sysbot+gh@w3.org>
@AmeliaBR, thanks for the comment, I hadn't noticed the Instagram photo page in my search. The numbers I quoted were for any document containing "backdrop-filter", including CSS or embedded style within an HTML. The platform stats numbers are counted any time the feature is actually used, e.g. when the pop-up pops up. So I think my numbers are still good; correct me if I'm wrong. My subsequent hand-analysis was to just use document.querySelectorAll() for the selector containing backdrop-filter and see what comes back, and it is definitely possible I missed some cases there. Again, thanks for the pointer to Instagram. From the sound of it, though, the Instagram banner would filter everything on the page, given that its parent stacking context is the root element. I am assuming none of the position:relative parents use z-index. Let me know if you disagree. (And if you could post a link directly to a photo from Instagram, that'd be helpful too.)

@mstange, thanks also for the comment about mixing opacity and backdrop-filter. It is definitely an interesting question, though I don't think it actually affects the isolation question. It does call into question the order-of-operations for backdrop-filter. We are debating it now, and I'll have a more detailed response soon.

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Received on Friday, 9 November 2018 21:09:24 UTC

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