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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=561636
+-->
+<head>
+  <title>Test for Bug 561636</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="application/javascript" src="/tests/SimpleTest/EventUtils.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=561636">Mozilla Bug 561636</a>
+<p id="display"></p>
+<iframe style='width:50px; height: 50px;' name='t'></iframe>
+<iframe style='width:50px; height: 50px;' name='t2' id='i'></iframe>
+<div id="content">
+  <form target='t' action='data:text/html,'>
+    <input required>
+    <input id='a' type='submit'>
+  </form>
+  <form target='t' action='data:text/html,'>
+    <input type='checkbox' required>
+    <button id='b' type='submit'></button>
+  </form>
+  <form target='t' action='data:text/html,'>
+    <input id='c' required>
+  </form>
+  <form target='t' action='data:text/html,'>
+    <input>
+    <input id='s2' type='submit'>
+  </form>
+  <form target='t2' action='data:text/html,'>
+    <input required>
+  </form>
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 561636 **/
+
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(runTest);
+
+function runTest()
+{
+  var formSubmitted = [ false, false ];
+  var invalidHandled = false;
+
+  var os = SpecialPowers.Cc['@mozilla.org/observer-service;1']
+                        .getService(SpecialPowers.Ci.nsIObserverService);
+  var observers = os.enumerateObservers("invalidformsubmit");
+
+  // The following test should not be done if there is no observer for
+  // "invalidformsubmit" because the form submission will not be canceled in that
+  // case.
+  if (!observers.hasMoreElements()) {
+    SimpleTest.finish();
+    return;
+  }
+
+  // Initialize
+  document.forms[0].addEventListener('submit', function(aEvent) {
+    aEvent.target.removeEventListener('submit', arguments.callee, false);
+    formSubmitted[0] = true;
+  }, false);
+
+  document.forms[1].addEventListener('submit', function(aEvent) {
+    aEvent.target.removeEventListener('submit', arguments.callee, false);
+    formSubmitted[1] = true;
+  }, false);
+
+  document.forms[2].addEventListener('submit', function(aEvent) {
+    aEvent.target.removeEventListener('submit', arguments.callee, false);
+    formSubmitted[2] = true;
+  }, false);
+
+  document.forms[3].addEventListener('submit', function(aEvent) {
+    aEvent.target.removeEventListener('submit', arguments.callee, false);
+    formSubmitted[3] = true;
+
+    ok(!formSubmitted[0], "Form 1 should not have been submitted because invalid");
+    ok(!formSubmitted[1], "Form 2 should not have been submitted because invalid");
+    ok(!formSubmitted[2], "Form 3 should not have been submitted because invalid");
+    ok(formSubmitted[3], "Form 4 should have been submitted because valid");
+
+    // Next test.
+    document.forms[4].submit();
+  }, false);
+
+  document.forms[4].elements[0].addEventListener('invalid', function(aEvent) {
+    aEvent.target.removeEventListener('invalid', arguments.callee, false);
+    invalidHandled = true;
+  }, false);
+
+  document.getElementById('i').addEventListener('load', function(aEvent) {
+    aEvent.target.removeEventListener('load', arguments.callee, false);
+
+    SimpleTest.executeSoon(function () {
+      ok(true, "Form 5 should have been submitted because submit() has been used even if invalid");
+      ok(!invalidHandled, "Invalid event should not have been sent");
+
+      SimpleTest.finish();
+    });
+  }, false);
+
+  document.getElementById('a').click();
+  document.getElementById('b').click();
+  var c = document.getElementById('c');
+  c.focus();
+  synthesizeKey("KEY_Enter", { code: "Enter" });
+  document.getElementById('s2').click();
+}
+
+</script>
+</pre>
+</body>
+</html>