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diff --git a/dom/html/test/test_bug598643.html b/dom/html/test/test_bug598643.html
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+++ b/dom/html/test/test_bug598643.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=598643
+-->
+<head>
+  <title>Test for Bug 598643</title>
+  <script 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=598643">Mozilla Bug 598643</a>
+<p id="display"></p>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 598643 **/
+
+function createFileWithData(fileName, fileData)
+{
+  return new File([new Blob([fileData], { type: "text/plain" })], fileName);
+}
+
+function testFileControl(aElement)
+{
+  aElement.type = 'file';
+
+  var file = createFileWithData("file_bug598643", "file content");
+  SpecialPowers.wrap(aElement).mozSetFileArray([file]);
+
+  ok(aElement.validity.valid, "the file control should be valid");
+  ok(!aElement.validity.tooLong,
+     "the file control shouldn't suffer from being too long");
+}
+
+var types = [
+  // These types can be too long.
+  [ "text", "email", "password", "url", "search", "tel" ],
+  // These types can't be too long.
+  [ "radio", "checkbox", "submit", "button", "reset", "image", "hidden",
+    'number', 'range', 'date', 'time', 'color', 'month', 'week',
+    'datetime-local' ],
+];
+
+var input = document.createElement("input");
+input.maxLength = 1;
+input.value = "foo";
+
+// Too long types.
+for (type of types[0]) {
+  input.type = type
+  if (type == 'email') {
+    input.value = "foo@bar.com";
+  } else if (type == 'url') {
+    input.value = 'http://foo.org';
+  }
+
+  todo(!input.validity.valid, "the element should be invalid [type=" + type + "]");
+  todo(input.validity.tooLong,
+       "the element should suffer from being too long [type=" + type + "]");
+
+  if (type == 'email' || type == 'url') {
+    input.value = 'foo';
+  }
+}
+
+// Not too long types.
+for (type of types[1]) {
+  input.type = type
+  ok(input.validity.valid, "the element should be valid [type=" + type + "]");
+  ok(!input.validity.tooLong,
+     "the element shouldn't suffer from being too long [type=" + type + "]");
+}
+
+testFileControl(input);
+
+</script>
+</pre>
+</body>
+</html>