diff --git a/components/script/dom/document.rs b/components/script/dom/document.rs
index ad7af5562f9..18b50faff5d 100644
--- a/components/script/dom/document.rs
+++ b/components/script/dom/document.rs
@@ -1540,6 +1540,9 @@ impl<'a> DocumentMethods for JSRef<'a, Document> {
                 Some(element) => element,
                 None => return false,
             };
+            if element.namespace() != &ns!(HTML) {
+                return false;
+            }
             element.get_attribute(&ns!(""), &atom!("name")).root().map_or(false, |attr| {
                 // FIXME(https://github.com/rust-lang/rust/issues/23338)
                 let attr = attr.r();
diff --git a/tests/wpt/metadata/html/dom/documents/dom-tree-accessors/document.getElementsByName/document.getElementsByName-namespace.html.ini b/tests/wpt/metadata/html/dom/documents/dom-tree-accessors/document.getElementsByName/document.getElementsByName-namespace.html.ini
deleted file mode 100644
index 75b5478bcae..00000000000
--- a/tests/wpt/metadata/html/dom/documents/dom-tree-accessors/document.getElementsByName/document.getElementsByName-namespace.html.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[document.getElementsByName-namespace.html]
-  type: testharness
-  [getElementsByName and foreign namespaces]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/dom/documents/dom-tree-accessors/document.getElementsByName/document.getElementsByName-namespace.xhtml.ini b/tests/wpt/metadata/html/dom/documents/dom-tree-accessors/document.getElementsByName/document.getElementsByName-namespace.xhtml.ini
deleted file mode 100644
index 299bdfc1efe..00000000000
--- a/tests/wpt/metadata/html/dom/documents/dom-tree-accessors/document.getElementsByName/document.getElementsByName-namespace.xhtml.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[document.getElementsByName-namespace.xhtml]
-  type: testharness
-  [getElementsByName and foreign namespaces]
-    expected: FAIL
-