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Issue
239513010:
Only boxes should have child transform layers. (Closed)
DescriptionOnly boxes should have child transform layers.
The child transform layer exists to apply a perspective
transform on its composited descendants. If this were to
be necessary, the renderer housing the transform should
be a box. Without this requirement, we cannot determine
the correct size of the composited layer which will own
the perpective transform.
Rationale,
According to http://www.w3.org/TR/css-transforms-1/
Perspective can apply to "transformable elements."
That is, to
"""
an element whose layout is governed by the CSS box model
which is either a block-level or atomic inline-level
element, or whose display property computes to table-row,
table-row-group, table-header-group, table-footer-group,
table-cell, or table-caption [CSS21] an element in the
SVG namespace and not governed by the CSS box model which
has the attributes transform, ‘patternTransform‘ or
gradientTransform [SVG11].
"""
block-level elements and atomic inline-level elements
are boxes (see http://www.w3.org/TR/CSS2/visuren.html#x13
for more info on atomic inline-level elements), as are
the table-* things.
SVG elements could cause problems if they could be
separately composited, but they cannot be currently and
the SVG root is a box.
BUG=363873
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=171832
Patch Set 1 #Patch Set 2 : de-crazified the test. #
Total comments: 6
Patch Set 3 : Address reviewer feedback. #
Messages
Total messages: 9 (0 generated)
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