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Sign upfilter should be defined to establish a containing block for fixed and absolutely positioned elements #18507
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See w3c/fxtf-drafts#11. Currently we only do this for stacking contexts with transformations and iframes. It might be a good idea to move all of this functionality to Servo though, as I'm not sure that Gecko needs it.
This used to be servo/webrender#1101 and that issue has some more context.