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LibWeb: Implement anchor-size(..) function parsing

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This parses `anchor-size(..)` functions in CSS, but does not yet result
in a useful `Size`: we need style & layout interleaving similar to
container queries for this, since the resulting value depends on layout
results.

Not supported yet: `anchor-size()` appearing inside a `calc()` node.

Adds 4280 WPT subtest passes in `css/css-anchor-position`.
This commit is contained in:
Jelle Raaijmakers 2025-07-30 14:14:53 +02:00 • committed by Tim Ledbetter
commit c4f5e7bee3
Notes: github-actions[bot] 2025-07-30 17:15:09 +00:00
16 changed files with 318 additions and 3 deletions
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7
Libraries/LibWeb/CSS/CSSStyleValue.cpp
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@ -13,6 +13,7 @@
#include <LibWeb/CSS/CSSStyleValue.h>
#include <LibWeb/CSS/Parser/Parser.h>
#include <LibWeb/CSS/StyleValues/AbstractImageStyleValue.h>
#include <LibWeb/CSS/StyleValues/AnchorSizeStyleValue.h>
#include <LibWeb/CSS/StyleValues/AngleStyleValue.h>
#include <LibWeb/CSS/StyleValues/BackgroundRepeatStyleValue.h>
#include <LibWeb/CSS/StyleValues/BackgroundSizeStyleValue.h>
@ -83,6 +84,12 @@ AbstractImageStyleValue const& CSSStyleValue::as_abstract_image() const
return static_cast<AbstractImageStyleValue const&>(*this);
}
AnchorSizeStyleValue const& CSSStyleValue::as_anchor_size() const
{
VERIFY(is_anchor_size());
return static_cast<AnchorSizeStyleValue const&>(*this);
}
AngleStyleValue const& CSSStyleValue::as_angle() const
{
VERIFY(is_angle());