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LibWeb: Support the CSS 'unset' value
This works as 'inherit' for inherited properties and 'initial' for everything else.
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@ -684,6 +684,18 @@ void StyleComputer::compute_defaulted_property_value(StyleProperties& style, DOM
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value_slot = get_inherit_value(property_id, element, pseudo_element);
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return;
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}
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// https://www.w3.org/TR/css-cascade-4/#inherit-initial
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// If the cascaded value of a property is the unset keyword,
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if (value_slot->is_unset()) {
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if (is_inherited_property(property_id)) {
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// then if it is an inherited property, this is treated as inherit,
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value_slot = get_inherit_value(property_id, element, pseudo_element);
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} else {
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// and if it is not, this is treated as initial.
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value_slot = property_initial_value(property_id);
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}
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}
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}
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// https://www.w3.org/TR/css-cascade/#defaulting
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