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LibWeb: Implement CSS declaration block's "updating flag"

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This flag is used to prevent reparsing the style attribute after it is
automatically updated after using the CSSOM API to mutate style.
This commit is contained in:
Andreas Kling 2022-04-11 16:56:52 +02:00
parent 66618a666b
commit a8afb883c1
4 changed files with 27 additions and 2 deletions
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12
Userland/Libraries/LibWeb/CSS/CSSStyleDeclaration.cpp
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@ -125,10 +125,22 @@ DOM::ExceptionOr<String> PropertyOwningCSSStyleDeclaration::remove_property(Prop
// https://drafts.csswg.org/cssom/#update-style-attribute-for
void ElementInlineCSSStyleDeclaration::update_style_attribute()
{
// 1. Assert: declaration block’s computed flag is unset.
// NOTE: Unnecessary, only relevant for ResolvedCSSStyleDeclaration.
// 2. Let owner node be declaration block’s owner node.
// 3. If owner node is null, then return.
if (!m_element)
return;
// 4. Set declaration block’s updating flag.
m_updating = true;
// 5. Set an attribute value for owner node using "style" and the result of serializing declaration block.
m_element->set_attribute(HTML::AttributeNames::style, serialized());
// 6. Unset declaration block’s updating flag.
m_updating = false;
}
// https://drafts.csswg.org/cssom/#set-a-css-declaration