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+<!DOCTYPE html>
+<head>
+<meta charset="utf-8">
+<title>HTML Test: focus - zero tabindex</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 if the tabindex attribute controls whether an element is supposed to be focusable">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+</head>
+<h2>Steps:</h2>
+<ol>
+  <li>Press 'Tab' key in 10 seconds.</li>
+</ol>
+<h2>Expect results:</h2>
+<p>PASS</p>
+<div id="log"></div>
+<form id="fm">
+  <input id="test" tabindex="0">
+</form>
+<script>
+
+//This test can be automated once we have an uniform way to use webdriver.
+var t = async_test("The element with a zero tabindex must be focused by press 'Tab' key");
+
+setup({timeout: 10000});
+
+document.forms.fm.addEventListener("focus", function (evt) {
+  t.step(function () {
+    var testEle = document.getElementById("test");
+    assert_equals(testEle.tabIndex, 0, "The tabIndex attribute of the input element should be 0.");
+    assert_equals(evt.target, testEle, "The input element must be focused.");
+    assert_equals(document.activeElement, testEle, "The input element must be activated.");
+  });
+  t.done();
+}, true);
+
+document.addEventListener("keydown", function (evt) {
+  t.step(function () {
+    assert_equals(evt.keyCode, 9, "Please press 'Tab' key.");
+  });
+}, true);
+
+</script>