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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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10
components/script_layout_interface/wrapper_traits.rs
View file

@ -491,4 +491,14 @@ pub trait ThreadSafeLayoutElement<'dom>:
}
fn is_shadow_host(&self) -> bool;
/// Returns whether this node is a body element of an html element root
/// in an HTML element document.
///
/// Note that this does require accessing the parent, which this interface
/// technically forbids. But accessing the parent is only unsafe insofar as
/// it can be used to reach siblings and cousins. A simple immutable borrow
/// of the parent data is fine, since the bottom-up traversal will not process
/// the parent until all the children have been processed.
fn is_body_element_of_html_element_root(&self) -> bool;
}