* layout: Fix behavior of `transform-style: preserve-3d`
This makes `transform-style: preserve-3d` establish a containing block
for all descendants, as specified here:
<https://drafts.csswg.org/css-transforms-2/#transform-style-property>
Signed-off-by: Daniel Hast <hast.daniel@protonmail.com>
* layout: Check for transformable elements
Adds a new `is_transformable` helper method and use this in several other
methods, including the methods for whether the fragment establishes a
new stacking context or a containing block for all descendants.
Signed-off-by: Daniel Hast <hast.daniel@protonmail.com>
* Use generic green square reference for reftest.
Signed-off-by: Daniel Hast <hast.daniel@protonmail.com>
* layout: Fix stacking context & containing block checks.
Only the computed value of `transform-style` should be used to determine
whether the element establishes a stacking context and/or a containing
block, not the used value.
Signed-off-by: Daniel Hast <hast.daniel@protonmail.com>
* Update clip-no-stacking-context test expectation to pass.
Signed-off-by: Daniel Hast <hast.daniel@protonmail.com>
---------
Signed-off-by: Daniel Hast <hast.daniel@protonmail.com>
* Implement support for `drop-shadow`
* Clean up remnant from early attempts
* Fix misleading comments on GenericSimpleShadow
If Servo-specific `style` changes will need to be upstreamed anyway, I might as well fix a thing that had thrown me off!
* Revert "Fix misleading comments on GenericSimpleShadow"
This reverts commit cdc810b826ac082041adc212c24649ee3b86ca0a.
* Clean up an import
* Update test expectations
* Fix missing expectation on Layout 2013
