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Test Info:

<!DOCTYPE html>
<meta charset="utf-8">
<title>HTML Test: focus - document-level APIs</title>
<link rel="author" title="Intel" href="">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<input id="test">
test(function () {
assert_equals(document.activeElement, document.body, "The active element should be the body element.");
}, "The body element must be the active element if no element is focused");
test(function () {
assert_equals(document.activeElement, document.getElementById("test"), "The active element should be the input element.");
}, "The element must be the active element if it is focused");
function frame_load () {
test(function () {
assert_equals(document.activeElement, document.getElementById("fr"), "The active element should be the iframe element.");
}, "When a child browsing context is focused, its browsing context container is also focused");
test(function () {
var doc = document.implementation.createHTMLDocument("test");
assert_false(doc.hasFocus(), "The hasFocus() method should return false.");
}, "The hasFocus() method must return false if the Document has no browsing context");
<iframe id="fr" src="support/test.html" onload="frame_load()"></iframe>