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Detect body elements during layout

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During layout it is often useful, for various specification reasons, to
know if an element is the `<body>` element of an `<html>` element root. There
are a couple places where a brittle heuristic is used to detect `<body>`
elements. This information is going to be even more important to
properly handle `<html>` elements that inherit their overflow property from
their `<body>` children.

Implementing this properly requires updating the DOM wrapper interface.
This check does reach up to the parent of thread-safe nodes, but this is
essentially the same kind of operation that `parent_style()` does, so is
ostensibly safe.

This change should not change any behavior and is just a preparation
step for properly handle `<body>` overflow.
This commit is contained in:
Martin Robinson 2023-04-30 20:21:58 +02:00
parent 77a184a0e7
commit 72302e2dae
26 changed files with 487 additions and 277 deletions
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2
components/layout_2020/flexbox/layout.rs
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@ -732,7 +732,7 @@ impl FlexLine<'_> {
let margin = flex_context.sides_to_flow_relative(*margin);
let collapsed_margin = CollapsedBlockMargins::from_margin(&margin);
BoxFragment::new(
item.box_.tag(),
item.box_.base_fragment_info(),
item.box_.style().clone(),
fragments,
content_rect,