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Auto merge of #19803 - jonleighton:issue-19765, r=emilio

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Implement Element::has_css_layout_box()

r? emilio

Here's my initial attempt to fix #19430. It seems surprisingly simple so I am wondering whether I have missed something! (Or maybe it just actually is quite simple...)

Some things I am unsure about:

1. The spec seems vague about what a [CSS layout box](https://drafts.csswg.org/cssom-view/#css-layout-box) actually is. Indeed it says: "The terms CSS layout box and SVG layout box are not currently defined by CSS or SVG."
2. One thing the spec *does* say explicitly is "For the purpose of the requirements in this specification, elements that have a computed value of the display property that is table-column or table-column-group must be considered to have an associated CSS layout box (the column or column group, respectively)." I am unclear about the relevance of this, since [overflow does not apply](https://drafts.csswg.org/css-overflow-3/#overflow-properties) to an [internal table element](https://drafts.csswg.org/css-display-3/#layout-specific-display). Therefore I haven't done anything about this explicitly, but maybe I'm missing some nuance.

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bors-servo 2018-01-19 14:37:57 -06:00 • committed by GitHub
commit bccb757bcd
3 changed files with 36 additions and 4 deletions
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9
components/script/dom/element.rs
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@ -348,11 +348,12 @@ 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