1 files changed, 36 insertions, 0 deletions
diff --git a/testing/web-platform/tests/custom-elements/v0/registering/extensions-to-document-interface/custom-element-name.html b/testing/web-platform/tests/custom-elements/v0/registering/extensions-to-document-interface/custom-element-name.html
new file mode 100644
index 000000000..e276e834a
--- /dev/null
+++ b/testing/web-platform/tests/custom-elements/v0/registering/extensions-to-document-interface/custom-element-name.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Custom element local name is the lowercased value of the EXTENDS property, supplied to Document.registerElement()</title>
+<meta name="author" title="Sergey G. Grekhov" href="mailto:sgrekhov@unipro.ru">
+<meta name="assert" content="Custom element local name is the lowercased value of the EXTENDS property">
+<link rel="help" href="http://www.w3.org/TR/custom-elements/#extensions-to-document-interface-to-register">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../../testcommon.js"></script>
+</head>
+<body>
+<div id="log"></div>
+<script>
+test(function() {
+    var doc = newHTMLDocument();
+
+    HTML5_ELEMENTS.forEach(function(tagName) {
+        var name = 'x-' + tagName;
+        var obj = doc.createElement(tagName);
+        var proto = Object.create(obj.constructor.prototype);
+        var GeneratedConstructor = doc.registerElement(name, {
+            prototype: proto,
+            extends: tagName
+        });
+        var customElement = new GeneratedConstructor();
+
+        assert_equals(customElement.localName, tagName.toLowerCase(),
+            'Custom element local name should be a lowercased value of the EXTENDS property, ' +
+            'supplied to Document.registerElement()');
+    });
+}, 'Custom element local name is the lowercased value of the EXTENDS property, ' +
+    'supplied to Document.registerElement()');
+</script>
+</body>
+</html>