Re: [fxtf-drafts] filter should be defined to establish a containing block for fixed and absolutely positioned elements (#11)

The only reference to this special case I see in [the spec](https://drafts.fxtf.org/filter-effects/) is:

> A value other than none for the filter property results in the creation of a containing block for absolute and fixed positioned descendants unless the element it applies to is a document root element in the current browsing context. The list of functions are applied in the order provided.

Which is not quite only what's going on. The actual behavior is a lot more subtle, as you need to also "lift" the filters from the root element box to the viewport (minus scrollbars), so that they apply to fixed pos elements, etc.

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Received on Wednesday, 26 August 2020 17:35:43 UTC