1 files changed, 55 insertions, 0 deletions
diff --git a/dom/tests/mochitest/webcomponents/test_bug1276240.html b/dom/tests/mochitest/webcomponents/test_bug1276240.html
new file mode 100644
index 000000000..33e532a6a
--- /dev/null
+++ b/dom/tests/mochitest/webcomponents/test_bug1276240.html
@@ -0,0 +1,55 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1276240
+-->
+<head>
+  <title>Test for Bug 1276240</title>
+  <script type="text/javascript" src="/MochiKit/MochiKit.js"></script>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<a target="_blank"
+	href="https://bugzilla.mozilla.org/show_bug.cgi?id=1276240">Mozilla Bug 1276240</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+/** Test for Bug 1276240 **/
+// when passing null for the second argument, it would be ignored
+
+function test() {
+  var e = document.createElement("p", null);
+  is(e.getAttribute("is"), null);
+
+  e = document.createElement("p", undefined);
+  is(e.getAttribute("is"), null);
+
+  e = document.createElementNS("http://www.w3.org/1999/xhtml", "p", null);
+  is(e.getAttribute("is"), null);
+
+  e = document.createElementNS("http://www.w3.org/1999/xhtml", "p", undefined);
+  is(e.getAttribute("is"), null);
+}
+
+function runTest() {
+  test();
+  SimpleTest.finish();
+}
+
+// test with webcomponents enabled
+test();
+
+// test with webcomponents disabled
+SimpleTest.waitForExplicitFinish();
+SpecialPowers.pushPrefEnv(
+  { 'set': [["dom.webcomponents.enabled", false]]}, runTest);
+
+</script>
+</pre>
+</body>
+</html>