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

Just as clarification, our interpretation of the latest draft (including #263 ) is the following:
- Non-none filter value establishes a containing block for elements.
- The exception to this is the document element. In other words if the document element is filtered, the filter is applied after scroll and clip but before viewport scrollbars. This logic applies to all frames, including iframes.

This means that:
1. body is not treated any differently from any other non-document-element element.*
2. fixed position children of filtered document element do not scroll (ie, the same behavior as if the document element was not filtered).

* - @chrishtr and I discussed this and we believe that this is good behavior, which avoids a quirk in which document element "steals" body's filter.

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Received on Thursday, 26 April 2018 20:37:26 UTC