diff --git a/Libraries/LibWeb/CSS/Parser/Parser.cpp b/Libraries/LibWeb/CSS/Parser/Parser.cpp
index 8dcfc1e49c3..c277f906592 100644
--- a/Libraries/LibWeb/CSS/Parser/Parser.cpp
+++ b/Libraries/LibWeb/CSS/Parser/Parser.cpp
@@ -1427,14 +1427,18 @@ bool Parser::is_valid_in_the_current_context(AtRule const& at_rule) const
     if (m_rule_context.is_empty())
         return true;
 
+    // Only grouping rules can be nested within style rules
+    if (m_rule_context.contains_slow(ContextType::Style))
+        return first_is_one_of(at_rule.name, "layer", "media", "supports");
+
     switch (m_rule_context.last()) {
     case ContextType::Unknown:
         // If the context is an unknown type, we don't accept anything.
         return false;
 
     case ContextType::Style:
-        // Style rules can contain grouping rules
-        return first_is_one_of(at_rule.name, "layer", "media", "supports");
+        // Already handled above
+        VERIFY_NOT_REACHED();
 
     case ContextType::AtLayer:
     case ContextType::AtMedia:
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-nesting/invalid-inner-rules.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-nesting/invalid-inner-rules.txt
index c4e8cede63a..083010be2af 100644
--- a/Tests/LibWeb/Text/expected/wpt-import/css/css-nesting/invalid-inner-rules.txt
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-nesting/invalid-inner-rules.txt
@@ -2,6 +2,7 @@ Harness status: OK
 
 Found 2 tests
 
-2 Fail
-Fail	Simple CSSOM manipulation of subrules
+1 Pass
+1 Fail
+Pass	Simple CSSOM manipulation of subrules
 Fail	Simple CSSOM manipulation of subrules 1
\ No newline at end of file