diff --git a/third_party/blink/renderer/core/sanitizer/sanitizer.cc b/third_party/blink/renderer/core/sanitizer/sanitizer.cc
index f12f2660b60d6..3cf3ee81b3c5c 100644
--- a/third_party/blink/renderer/core/sanitizer/sanitizer.cc
+++ b/third_party/blink/renderer/core/sanitizer/sanitizer.cc
@@ -858,26 +858,29 @@ void Sanitizer::SanitizeJavascriptNavigationAttributes(Element* element,
   }
 
   // Attributes that trigger navigation:
+  // Use Matches() (prefix-insensitive) rather than operator== so prefixed
+  // XHTML/SVG elements parsed via the XML parser are recognised, mirroring the
+  // SanitizerNameSet/Map semantics used everywhere else in the sanitizer.
   const QualifiedName& qname = element->TagQName();
-  if (qname == html_names::kATag || qname == html_names::kAreaTag ||
-      qname == html_names::kBaseTag) {
+  if (qname.Matches(html_names::kATag) || qname.Matches(html_names::kAreaTag) ||
+      qname.Matches(html_names::kBaseTag)) {
     RemoveAttributeIfProtocolIsJavaScript(element, html_names::kHrefAttr);
-  } else if (qname == svg_names::kATag ||
+  } else if (qname.Matches(svg_names::kATag) ||
              element->namespaceURI() == mathml_names::kNamespaceURI) {
     RemoveAttributeIfProtocolIsJavaScript(element, html_names::kHrefAttr);
     RemoveAttributeIfProtocolIsJavaScript(element, xlink_names::kHrefAttr);
-  } else if (qname == html_names::kButtonTag ||
-             qname == html_names::kInputTag) {
+  } else if (qname.Matches(html_names::kButtonTag) ||
+             qname.Matches(html_names::kInputTag)) {
     RemoveAttributeIfProtocolIsJavaScript(element, html_names::kFormactionAttr);
-  } else if (qname == html_names::kFormTag) {
+  } else if (qname.Matches(html_names::kFormTag)) {
     RemoveAttributeIfProtocolIsJavaScript(element, html_names::kActionAttr);
-  } else if (qname == html_names::kIFrameTag) {
+  } else if (qname.Matches(html_names::kIFrameTag)) {
     RemoveAttributeIfProtocolIsJavaScript(element, html_names::kSrcAttr);
 
     // SVG animations of navigating attributes:
-  } else if (qname == svg_names::kAnimateTag ||
-             qname == svg_names::kAnimateTransformTag ||
-             qname == svg_names::kSetTag) {
+  } else if (qname.Matches(svg_names::kAnimateTag) ||
+             qname.Matches(svg_names::kAnimateTransformTag) ||
+             qname.Matches(svg_names::kSetTag)) {
     RemoveAttributeIfValueIsHref(element, svg_names::kAttributeNameAttr);
   }
 }