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LibWeb: Support the CSS 'unset' value

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This works as 'inherit' for inherited properties and 'initial' for
everything else.
This commit is contained in:
Andreas Kling 2022-03-12 17:00:29 +01:00
parent 515db5fc1b
commit 4a14c4dae8
1 changed files with 12 additions and 0 deletions
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12
Userland/Libraries/LibWeb/CSS/StyleComputer.cpp
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@ -684,6 +684,18 @@ void StyleComputer::compute_defaulted_property_value(StyleProperties& style, DOM
value_slot = get_inherit_value(property_id, element, pseudo_element);
return;
}
// https://www.w3.org/TR/css-cascade-4/#inherit-initial
// If the cascaded value of a property is the unset keyword,
if (value_slot->is_unset()) {
if (is_inherited_property(property_id)) {
// then if it is an inherited property, this is treated as inherit,
value_slot = get_inherit_value(property_id, element, pseudo_element);
} else {
// and if it is not, this is treated as initial.
value_slot = property_initial_value(property_id);
}
}
}
// https://www.w3.org/TR/css-cascade/#defaulting