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

From: Markus Stange via GitHub <sysbot+gh@w3.org>
Date: Tue, 13 Nov 2018 20:50:48 +0000
To: public-fxtf-archive@w3.org
Message-ID: <issue_comment.created-438431803-1542142247-sysbot+gh@w3.org>
Coming back to original issue:

If we decide that backdrop-filter should respect isolation, then the web author is in control of the isolation boundaries. If we decide that it should *ignore* isolation, then the web author cannot choose an isolation boundary even if they want isolation.

There has been a proposal to allow web authors to turn off the implied isolation on stacking contexts: `isolation: accumulate`. This value [used to be part of compositing-2](https://github.com/w3c/fxtf-drafts/blob/a7fda53a9bbe527c025f0ead13e53498511d07fd/compositing/index.html) but was removed again. [This section about `enable-background: accumulate` in an old SVG spec](https://www.w3.org/TR/2009/WD-SVGCompositing-20090430/#enable-background) has a relatively precise description of how it would work.

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Please view or discuss this issue at https://github.com/w3c/fxtf-drafts/issues/53#issuecomment-438431803 using your GitHub account
Received on Tuesday, 13 November 2018 20:50:51 UTC

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