diff --git a/Libraries/LibWeb/WebIDL/ObservableArray.cpp b/Libraries/LibWeb/WebIDL/ObservableArray.cpp
index 13c76e61570..789f2ceebcc 100644
--- a/Libraries/LibWeb/WebIDL/ObservableArray.cpp
+++ b/Libraries/LibWeb/WebIDL/ObservableArray.cpp
@@ -69,7 +69,8 @@ JS::ThrowCompletionOr<void> ObservableArray::append(JS::Value value)
 void ObservableArray::clear()
 {
     while (!indexed_properties().is_empty()) {
-        indexed_properties().storage()->take_first();
+        auto deleted_value = indexed_properties().storage()->take_first().value;
+        MUST(m_on_delete_an_indexed_value->function()(deleted_value));
     }
 }
 
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/cssom/CSSStyleSheet-constructable-invalidation.txt b/Tests/LibWeb/Text/expected/wpt-import/css/cssom/CSSStyleSheet-constructable-invalidation.txt
index b8fecef6a39..53c4124707f 100644
--- a/Tests/LibWeb/Text/expected/wpt-import/css/cssom/CSSStyleSheet-constructable-invalidation.txt
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/cssom/CSSStyleSheet-constructable-invalidation.txt
@@ -2,8 +2,7 @@ Harness status: OK
 
 Found 3 tests
 
-2 Pass
-1 Fail
-Fail	mutating constructed CSSStyleSheet applied to root invalidates styles
+3 Pass
+Pass	mutating constructed CSSStyleSheet applied to root invalidates styles
 Pass	mutating constructed CSSStyleSheet applied to shadowdom invalidates styles
 Pass	mutating dependent constructed CSSStyleSheet applied to shadowdom invalidates styles
\ No newline at end of file