Jon Leighton 902edb925e Implement Element::has_css_layout_box() ...

Calling scroll() on an element which is not rendered (by a parent with
display: none) would previously cause a crash. In fact, we should
terminate the algorithm
[https://drafts.csswg.org/cssom-view/#dom-element-scroll] at step 10 in
this situation.

The fix hinges on implementing Element::has_css_layout_box() correctly,
rather than just returning true in all cases as we did previously.

Fixes #19430.

2018-01-18 18:31:16 +01:00

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