1 files changed, 67 insertions, 0 deletions
diff --git a/dom/events/test/test_submitevent_on_form.html b/dom/events/test/test_submitevent_on_form.html
new file mode 100644
index 0000000000..01cd8f28ee
--- /dev/null
+++ b/dom/events/test/test_submitevent_on_form.html
@@ -0,0 +1,67 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test submit event on form</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="/tests/SimpleTest/EventUtils.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+  <form action="javascript:doDefault()" id="form">
+    <input name="n1" value="v1">
+    <input type="submit" value="Do Default Action">
+  </form>
+  <pre id="test">
+  <script type="application/javascript">
+SimpleTest.waitForExplicitFinish();
+SimpleTest.waitForFocus(runTests);
+
+var defaultActionCount = 0;
+
+function doDefault()
+{
+  defaultActionCount++;
+}
+
+async function runTests()
+{
+  const form = document.getElementById("form");
+  let formDataInEvent = null;
+
+  // Test if submission from submit() is deferred.
+  await SpecialPowers.pushPrefEnv({
+    set: [["dom.forms.submit.trusted_event_only", false]],
+  });
+
+  form.addEventListener("submit", function(e) {
+    form.elements[0].value = "v1";
+    form.submit();
+    form.elements[0].value = "v2";
+  }, { once: true });
+
+  form.addEventListener('formdata', e => {
+    formDataInEvent = e.formData;
+  });
+
+  form.dispatchEvent(new Event('submit'));
+  await new Promise(resolve => SimpleTest.executeSoon(resolve));
+
+  is(defaultActionCount, 1, "should only submit once");
+  is(formDataInEvent.get('n1'), 'v2', "submission from submit() should be deferred");
+
+  // Test untrusted submit event shouldn't trigger form default action.
+  defaultActionCount = 0;
+  await SpecialPowers.pushPrefEnv({
+    set: [["dom.forms.submit.trusted_event_only", true]],
+  });
+
+  form.dispatchEvent(new Event('submit'));
+  setTimeout(() => {
+    is(defaultActionCount, 0, "untrusted submit event shouldn't trigger form default action");
+    SimpleTest.finish();
+  });
+}
+  </script>
+  </pre>
+</body>
+</html>