1 files changed, 39 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/syntax/serializing-xml-fragments/outerHTML.html b/testing/web-platform/tests/html/syntax/serializing-xml-fragments/outerHTML.html
new file mode 100644
index 0000000000..c6582fa9db
--- /dev/null
+++ b/testing/web-platform/tests/html/syntax/serializing-xml-fragments/outerHTML.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>HTML Test: element.outerHTML to verify XML fragment serialization algorithm</title>
+    <link rel="author" title="Intel" href="http://www.intel.com/">
+    <link rel="help" href="https://w3c.github.io/DOM-Parsing/#dfn-concept-serialize-xml">
+    <link rel="help" href="https://w3c.github.io/DOM-Parsing/#widl-Element-outerHTML">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="../../resources/common.js"></script>
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      test(function() {
+        var doc = document.implementation.createDocument(null, "");
+        assert_equals(doc.contentType, "application/xml");
+        var html_ns = "http://www.w3.org/1999/xhtml";
+        const non_void_elements = HTML5_ELEMENTS.filter(el => !HTML5_VOID_ELEMENTS.includes(el));
+        non_void_elements.forEach(function(ele) {
+          test(function() {
+            var e = doc.createElementNS(html_ns, ele);
+            assert_equals(e.outerHTML,
+                          `<${ele} xmlns="${html_ns}"></${ele}>`,
+                          ele + " node created." );
+          }, "Node for " + ele);
+        });
+        HTML5_VOID_ELEMENTS.forEach(function(ele) {
+          test(function() {
+            var e = doc.createElementNS(html_ns, ele);
+            assert_equals(e.outerHTML,
+                          `<${ele} xmlns="${html_ns}" />`,
+                          ele + " node created." );
+          }, "Node for " + ele);
+        });
+      }, document.title);
+    </script>
+  </body>
+</html>