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LibWeb: Invoke our internal attribute change handler from Attr

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Currently, every public DOM::Element method which changes an attribute
fires this handler itself. This was missed in commit 720f7ba, so any
user of that API would not fire the internal handler.

To fix this, and prevent any missing invocations in the future, invoke
the handler from from Attr::handle_attribute_changes. This method is
reached for all attribute changes, including adding/removing attributes.
This ensures the handler will always be fired, and reduces the footprint
of this ad-hoc behavior.

Note that our ad-hoc handler is not the "attribute change steps" noted
by the spec. Those are overridden only by a couple of specific elements,
e.g. HTMLSlotElement. However, we could easily make our ad-hoc handler
hook into those steps in the future.
This commit is contained in:
Timothy Flynn 2023-09-02 10:05:15 -04:00 • committed by Tim Flynn
parent 9aae50a9c3
commit 5ec76331e8
3 changed files with 21 additions and 25 deletions
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2
Userland/Libraries/LibWeb/DOM/Element.h
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@ -128,6 +128,8 @@ public:
Vector<FlyString> const& class_names() const { return m_classes; }
virtual void apply_presentational_hints(CSS::StyleProperties&) const { }
void run_attribute_change_steps(DeprecatedFlyString const& local_name, DeprecatedString const& old_value, DeprecatedString const& value, DeprecatedFlyString const& namespace_);
virtual void attribute_changed(DeprecatedFlyString const& name, DeprecatedString const& value);
struct [[nodiscard]] RequiredInvalidationAfterStyleChange {