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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>HTML Test: focus - the sequential focus navigation order</title>
+<link rel="author" title="Intel" href="http://www.intel.com/">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/#sequential-focus-navigation-and-the-tabindex-attribute">
+<meta assert="flag" content="interact">
+<meta assert="assert" content="Check the sequential focus navigation order">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<h2>Steps:</h2>
+<ol>
+  <li>Press 'Tab' key at least 10 times in 20 seconds.(Long press the 'Tab' key will be better.)</li>
+</ol>
+<h2>Expect results:</h2>
+<p>PASS</p>
+<div id="log"></div>
+<form id="fm">
+  <button id="btn0">tabindex(omitted)</button>
+  <button id="btn1" tabindex="">tabindex(empty)</button>
+  <button id="btn2" tabindex="a">tabindex(a)</button>
+  <button id="btn3" tabindex="-1">tabindex(-1)</button>
+  <button id="btn4" tabindex="0">tabindex(0)</button>
+  <button id="btn5" tabindex="3">tabindex(3)</button>
+  <button id="btn6" tabindex="2">tabindex(2)</button>
+  <button id="btn7" tabindex="2">tabindex(2)</button>
+  <button id="btn8" tabindex="2">tabindex(2)</button>
+  <button id="btn9" tabindex="1">tabindex(1)</button>
+</form>
+<script>
+
+//This test can be automated once we have an uniform way to use webdriver.
+var i = 0,
+    expectation = ["btn9", "btn6", "btn7", "btn8", "btn5", "btn0", "btn1", "btn2", "btn4"],
+    results = [],
+    t = async_test("The element with a zero tabindex must be focused by press 'Tab' key");
+
+setup(function () {
+  document.body.focus();
+}, {timeout: 20000});
+
+document.forms.fm.addEventListener("focus", function (evt) {
+  results.push(evt.target.id);
+  if (i >= 9) {
+    t.step(function () {
+      assert_array_equals(results, expectation);
+    });
+  }
+}, true);
+
+document.addEventListener("keydown", function (evt) {
+  if (evt.keyCode === 9) {
+    i += 1;
+    if (i === 10) {
+      t.done();
+    }
+  }
+}, true);
+
+</script>