[Bug 16328] Use of "containing block" does not match CSS2.1 definition

https://www.w3.org/Bugs/Public/show_bug.cgi?id=16328

--- Comment #21 from Boris Zbarsky <bzbarsky@mit.edu> ---
> I heard is that it would be very difficult to maintain position:fixed and apply the transform nonetheless

Which it is.  If you try actually scrolling your testcase at
https://jsfiddle.net/6phnrad7/1/ in Chrome you will note that it's not really
fixed exactly, because scrolling happens on the compositor and just brings the
entire transformed thing along, including the "fixed" piece.  Then a relayout
happens and it gets repositioned to its original viewport-relative place again.

This is probably not the scrolling behavior people expect out of "position:
fixed".

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Received on Friday, 21 October 2016 20:32:32 UTC