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LibWeb: Apply presentational hints for the HTMLHRElement align attribute

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This commit is contained in:
Tim Ledbetter 2025-02-18 07:56:59 +00:00 • committed by Andreas Kling
parent c217057cfd
commit 0e470d5cdf
Notes: github-actions[bot] 2025-02-18 11:07:39 +00:00
3 changed files with 69 additions and 1 deletions
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15
Libraries/LibWeb/HTML/HTMLHRElement.cpp
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@ -36,7 +36,7 @@ bool HTMLHRElement::is_presentational_hint(FlyString const& name) const
if (Base::is_presentational_hint(name))
return true;
return first_is_one_of(name, HTML::AttributeNames::color, HTML::AttributeNames::noshade, HTML::AttributeNames::width);
return first_is_one_of(name, HTML::AttributeNames::align, HTML::AttributeNames::color, HTML::AttributeNames::noshade, HTML::AttributeNames::width);
}
void HTMLHRElement::apply_presentational_hints(GC::Ref<CSS::CascadedProperties> cascaded_properties) const
@ -50,6 +50,19 @@ void HTMLHRElement::apply_presentational_hints(GC::Ref<CSS::CascadedProperties>
cascaded_properties->set_property_from_presentational_hint(CSS::PropertyID::BorderLeftStyle, CSS::CSSKeywordValue::create(CSS::Keyword::Solid));
}
if (name == HTML::AttributeNames::align) {
if (value.equals_ignoring_ascii_case("left"sv)) {
cascaded_properties->set_property_from_presentational_hint(CSS::PropertyID::MarginLeft, CSS::LengthStyleValue::create(CSS::Length::make_px(0)));
cascaded_properties->set_property_from_presentational_hint(CSS::PropertyID::MarginRight, CSS::CSSKeywordValue::create(CSS::Keyword::Auto));
} else if (value.equals_ignoring_ascii_case("right"sv)) {
cascaded_properties->set_property_from_presentational_hint(CSS::PropertyID::MarginLeft, CSS::CSSKeywordValue::create(CSS::Keyword::Auto));
cascaded_properties->set_property_from_presentational_hint(CSS::PropertyID::MarginRight, CSS::LengthStyleValue::create(CSS::Length::make_px(0)));
} else if (value.equals_ignoring_ascii_case("center"sv)) {
cascaded_properties->set_property_from_presentational_hint(CSS::PropertyID::MarginLeft, CSS::CSSKeywordValue::create(CSS::Keyword::Auto));
cascaded_properties->set_property_from_presentational_hint(CSS::PropertyID::MarginRight, CSS::CSSKeywordValue::create(CSS::Keyword::Auto));
}
}
// https://html.spec.whatwg.org/multipage/rendering.html#the-hr-element-2:attr-hr-color-3
// When an hr element has a color attribute, its value is expected to be parsed using the rules for parsing a legacy color value, and if that does not return failure,
// the user agent is expected to treat the attribute as a presentational hint setting the element's 'color' property to the resulting color.

31
Tests/LibWeb/Ref/expected/wpt-import/html/rendering/non-replaced-elements/the-hr-element-0/align-ref.html Normal file
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@ -0,0 +1,31 @@
<!doctype html>
<meta charset=utf-8>
<style>
.hr {
color: gray;
border-style: inset;
border-width: 1px;
margin: 0.5em auto;
width: 100px;
}
.left {
margin-left: 0;
}
.right {
margin-right: 0;
}
</style>
<div class='hr'></div>
<div class='hr left'></div>
<div class='hr'></div>
<div class='hr right'></div>
<div class='hr'></div>
<div class='hr'></div>
<div class='hr left'></div>
<div class='hr'></div>
<div class='hr right'></div>
<div class='hr'></div>

24
Tests/LibWeb/Ref/input/wpt-import/html/rendering/non-replaced-elements/the-hr-element-0/align.html Normal file
View file

@ -0,0 +1,24 @@
<!doctype html>
<meta charset="utf-8">
<link rel="match" href="../../../../../../expected/wpt-import/html/rendering/non-replaced-elements/the-hr-element-0/align-ref.html">
<style>
hr {
width: 100px;
}
</style>
<hr align=>
<hr align=left>
<hr align=center>
<hr align=right>
<hr align=foobar>
<script>
// Test the IDL attribute
const values = ['', 'left', 'center', 'right', 'foobar'];
values.forEach(value => {
const hr = document.createElement('hr');
hr.align = value;
document.body.appendChild(hr);
});
</script>