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Revert "Remove UA shadow usage from ImageDocument." #9177
Reverts "Remove UA shadow usage from ImageDocument."
After more investigation, the removal turned out violating the HTML spec.
The corresponding HTML spec:
The previous change introduced intermediate container
but it is not conforming to the spec. Originally the UA shadow was
attached to and hides the container and this CL restores the
Added a WPT test for checking the case.
Started: 2018-01-24 10:47:59
Browser: "Safari 11.0" (failures allowed)