diff --git a/Libraries/LibWeb/CSS/StyleComputer.cpp b/Libraries/LibWeb/CSS/StyleComputer.cpp
index 2d86f7e9c4d..d6dcde73fa6 100644
--- a/Libraries/LibWeb/CSS/StyleComputer.cpp
+++ b/Libraries/LibWeb/CSS/StyleComputer.cpp
@@ -3280,7 +3280,7 @@ void RuleCache::for_each_matching_rules(DOM::Element const& element, Optional<Ps
                 return;
         }
     }
-    if (auto it = rules_by_tag_name.find(element.local_name()); it != rules_by_tag_name.end()) {
+    if (auto it = rules_by_tag_name.find(element.lowercased_local_name()); it != rules_by_tag_name.end()) {
         if (callback(it->value) == IterationDecision::Break)
             return;
     }
diff --git a/Libraries/LibWeb/DOM/Element.h b/Libraries/LibWeb/DOM/Element.h
index 6941e7c9283..a12400ae8d7 100644
--- a/Libraries/LibWeb/DOM/Element.h
+++ b/Libraries/LibWeb/DOM/Element.h
@@ -117,6 +117,8 @@ public:
     virtual FlyString node_name() const final { return html_uppercased_qualified_name(); }
     FlyString const& local_name() const { return m_qualified_name.local_name(); }
 
+    FlyString const& lowercased_local_name() const { return m_qualified_name.lowercased_local_name(); }
+
     // NOTE: This is for the JS bindings
     FlyString const& tag_name() const { return html_uppercased_qualified_name(); }
 
diff --git a/Libraries/LibWeb/DOM/QualifiedName.cpp b/Libraries/LibWeb/DOM/QualifiedName.cpp
index c2937802667..531a2af72f2 100644
--- a/Libraries/LibWeb/DOM/QualifiedName.cpp
+++ b/Libraries/LibWeb/DOM/QualifiedName.cpp
@@ -56,6 +56,7 @@ QualifiedName::QualifiedName(FlyString const& local_name, Optional<FlyString> co
 
 QualifiedName::Impl::Impl(FlyString const& a_local_name, Optional<FlyString> const& a_prefix, Optional<FlyString> const& a_namespace)
     : local_name(a_local_name)
+    , lowercased_local_name(local_name.to_ascii_lowercase())
     , prefix(a_prefix)
     , namespace_(a_namespace)
 {
diff --git a/Libraries/LibWeb/DOM/QualifiedName.h b/Libraries/LibWeb/DOM/QualifiedName.h
index 9484dedfb87..b933eec1383 100644
--- a/Libraries/LibWeb/DOM/QualifiedName.h
+++ b/Libraries/LibWeb/DOM/QualifiedName.h
@@ -21,6 +21,8 @@ public:
     Optional<FlyString> const& prefix() const { return m_impl->prefix; }
     Optional<FlyString> const& namespace_() const { return m_impl->namespace_; }
 
+    FlyString const& lowercased_local_name() const { return m_impl->lowercased_local_name; }
+
     FlyString const& as_string() const { return m_impl->as_string; }
 
     struct Impl : public RefCounted<Impl> {
@@ -29,6 +31,7 @@ public:
 
         void make_internal_string();
         FlyString local_name;
+        FlyString lowercased_local_name;
         Optional<FlyString> prefix;
         Optional<FlyString> namespace_;
         FlyString as_string;
diff --git a/Libraries/LibWeb/SVG/Default.css b/Libraries/LibWeb/SVG/Default.css
index e4c8c26890a..5a5945d2a75 100644
--- a/Libraries/LibWeb/SVG/Default.css
+++ b/Libraries/LibWeb/SVG/Default.css
@@ -14,14 +14,8 @@ svg:not(:root), image, marker, pattern, symbol { overflow: hidden; }
     white-space-collapse: preserve-spaces;
 }
 
-/* FIXME: Allow setting the rest of these to `display: none`.
-          Currently that breaks <use> and <mask> and probably others. */
-desc, title, metadata,
-pattern, linearGradient, radialGradient,
-script, style {
-    display: none !important;
-}
-/*
+/* NOTE: These rules are in the SVG spec, but don't match how other engines behave.
+         So we simply comment them out for now.
 defs,
 clipPath, mask, marker,
 desc, title, metadata,
@@ -30,10 +24,11 @@ script, style,
 symbol {
     display: none !important;
 }
-*/
 :host(use) > symbol {
     display: inline !important;
 }
+*/
+
 :link, :visited {
     cursor: pointer;
 }