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servo/components/layout
bors-servo f1fab036ab Auto merge of #18212 - mrobinson:position-sticky, r=emilio
Add support for position:sticky

This leverages the position:sticky support in WebRender to bring basic
support for position:sticky in Servo. There are still some issues with
nested sticky flows as well as a few other corner cases. Tests are
imported from WPT and can be removed once we update to the latest
version.

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