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Implement Element::has_css_layout_box()

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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.
This commit is contained in:
Jon Leighton 2018-01-18 11:57:22 +01:00
parent 9f2b33c646
commit 902edb925e
3 changed files with 36 additions and 4 deletions
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9
components/script/dom/element.rs
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@ -349,11 +349,12 @@ impl Element {
}
// https://drafts.csswg.org/cssom-view/#css-layout-box
// Elements that have a computed value of the display property
// that is table-column or table-column-group
// FIXME: Currently, it is assumed to be true always
//
// We'll have no content box if there's no fragment for the node, and we use
// bounding_content_box, for simplicity, to detect this (rather than making a more specific
// query to the layout thread).
fn has_css_layout_box(&self) -> bool {
true
self.upcast::<Node>().bounding_content_box().is_some()
}
// https://drafts.csswg.org/cssom-view/#potentially-scrollable