From 039e0d478a41068e8696bb28dfb223182ee81c98 Mon Sep 17 00:00:00 2001
From: Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
Date: Sat, 18 Jan 2025 20:11:17 +0100
Subject: [PATCH] LibWeb: Use invalidation sets for id attribute style
 invalidation

---
 Libraries/LibWeb/DOM/Element.cpp | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Libraries/LibWeb/DOM/Element.cpp b/Libraries/LibWeb/DOM/Element.cpp
index cbc837a9886..5adcef7e31f 100644
--- a/Libraries/LibWeb/DOM/Element.cpp
+++ b/Libraries/LibWeb/DOM/Element.cpp
@@ -2016,6 +2016,17 @@ void Element::invalidate_style_after_attribute_change(FlyString const& attribute
         return;
     }
 
+    if (attribute_name == HTML::AttributeNames::id) {
+        Vector<CSS::InvalidationSet::Property> changed_properties;
+        if (old_value.has_value())
+            changed_properties.append({ .type = CSS::InvalidationSet::Property::Type::Id, .name = old_value.value() });
+        if (new_value.has_value())
+            changed_properties.append({ .type = CSS::InvalidationSet::Property::Type::Id, .name = new_value.value() });
+        changed_properties.append({ .type = CSS::InvalidationSet::Property::Type::Attribute, .name = HTML::AttributeNames::id });
+        invalidate_style(StyleInvalidationReason::ElementAttributeChange, changed_properties);
+        return;
+    }
+
     if (is_presentational_hint(attribute_name)
         || attribute_name_may_affect_selectors(*this, attribute_name)) {
         invalidate_style(StyleInvalidationReason::ElementAttributeChange);