But enable it in all tests because a lot of them rely on using it in the
style="" attribute for example, or in inline stylesheets, which will no longer
parse this (even in chrome documents), and we don't want to rewrite all the XUL
and XBL tests.
Differential Revision: https://phabricator.services.mozilla.com/D18027
Support for ExternalVR implementation
This PR adds the hook necessary for the ExternalVR rust-webvr driver.
Waiting on rust-webvr 0.9.3 to be published before landing.
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Ensure transparent hit test region is sized and positioned correctly.
This addresses some edge cases that were missed by #22156. Specifically, in some cases the transparent region was being placed in the display list in front of the scrollable content, rather than behind it, and the size of the region did not account for parent stacking context.
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Layout fullscreen top layer
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Implement the fullscreen top layer described at https://fullscreen.spec.whatwg.org/#top-layer
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Remove readfile callback
Reproducing what is done in libmlservo.
This simplifies a lot of things. No need for resources anymore.
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Add a reftest that entering fullscreen mode takes over the window
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Add a baseline reftest for fullscreen that ensures that going fullscreen actually uses the whole window. This uses a pref that requests that fullscreen mode takes over the window rather than the whole screen. The pref doesn't do anything right now, but is a bit of future-proofing for when we do have proper fullscreen.
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- [X] These changes fix#22804.
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Remove forked referrer policy tests
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Make the signal handler exit immediately
This addresses #22240 by immediately exiting, rather than sometimes triggering a SIGBUS by aborting that can be caught recursively.
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- [x] These changes fix#22240
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