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diff --git a/testing/web-platform/mozilla/tests/focus/Selection_extend.html b/testing/web-platform/mozilla/tests/focus/Selection_extend.html
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+++ b/testing/web-platform/mozilla/tests/focus/Selection_extend.html
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+<!doctype html>
+<meta charset=utf-8>
+<title>focus move tests caused by a call of Selection.extend()</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body>
+<div style="height: 3000px;">Spacer to check whether or not page was scrolled down to focused editor</div>
+<p id="staticBefore">static text</p>
+<div id="editor" contenteditable><p>content of editor</p></div>
+<div id="outerEditor" contenteditable
+><p>content of outer editor</p><div id="staticInEditor" contenteditable="false"
+><p>static content of outer editor</p><div id="innerEditor" contenteditable
+><p>content of inner editor</p></div></div></div>
+<p id="staticAfter">static text</p>
+<p><a id="anchor" href="about:blank">anchor</a></p>
+<script>
+"use strict";
+
+var staticBefore = {
+    element: document.getElementById("staticBefore"),
+    textNode: document.getElementById("staticBefore").firstChild,
+    textLength: document.getElementById("staticBefore").firstChild.length
+};
+var editor = {
+    element: document.getElementById("editor"),
+    textNode: document.getElementById("editor").firstChild.firstChild,
+    textLength: document.getElementById("editor").firstChild.firstChild.length
+};
+var outerEditor = {
+    element: document.getElementById("outerEditor"),
+    textNode: document.getElementById("outerEditor").firstChild.firstChild,
+    textLength: document.getElementById("outerEditor").firstChild.firstChild.length
+};
+var staticInEditor = {
+    element: document.getElementById("staticInEditor"),
+    textNode: document.getElementById("staticInEditor").firstChild,
+    textLength: document.getElementById("staticInEditor").firstChild.length
+};
+var innerEditor = {
+    element: document.getElementById("innerEditor"),
+    textNode: document.getElementById("innerEditor").firstChild.firstChild,
+    textLength: document.getElementById("innerEditor").firstChild.firstChild.length
+};
+var staticAfter = {
+    element: document.getElementById("staticAfter"),
+    textNode: document.getElementById("staticAfter").firstChild,
+    textLength: document.getElementById("staticAfter").firstChild.length
+};
+var anchor = {
+    element: document.getElementById("anchor"),
+    textNode: document.getElementById("anchor").firstChild,
+    textLength: document.getElementById("anchor").firstChild.length
+};
+
+function resetFocusAndSelectionRange(aFocus)
+{
+    document.getSelection().removeAllRanges();
+    if (document.activeElement) {
+        document.activeElement.blur();
+    }
+    if (aFocus) {
+        aFocus.element.focus();
+        document.getSelection().collapse(aFocus.textNode, 0);
+    } else {
+        document.getSelection().collapse(staticBefore.textNode, 0);
+    }
+    document.documentElement.scrollTop = 0;
+}
+
+test(function() {
+    resetFocusAndSelectionRange();
+    document.getSelection().extend(editor.textNode, 0);
+    assert_equals(document.activeElement, document.body);
+    assert_equals(document.documentElement.scrollTop, 0);
+}, "Active element should be the <body> after Selection.extend() from selection at start of the first text node of 'staticBefore' to start of the first text node of 'editor'");
+test(function() {
+    resetFocusAndSelectionRange();
+    document.getSelection().extend(outerEditor.textNode, 0);
+    assert_equals(document.activeElement, document.body);
+    assert_equals(document.documentElement.scrollTop, 0);
+}, "Active element should be the <body> after Selection.extend() from selection at start of the first text node of 'staticBefore' to start of the first text node of 'outerEditor'");
+test(function() {
+    resetFocusAndSelectionRange();
+    document.getSelection().extend(staticInEditor.textNode, 0);
+    assert_equals(document.activeElement, document.body);
+    assert_equals(document.documentElement.scrollTop, 0);
+}, "Active element should be the <body> after Selection.extend() from selection at start of the first text node of 'staticBefore' to start of the first text node of 'staticInEditor'");
+test(function() {
+    resetFocusAndSelectionRange();
+    document.getSelection().extend(innerEditor.textNode, 0);
+    assert_equals(document.activeElement, document.body);
+    assert_equals(document.documentElement.scrollTop, 0);
+}, "Active element should be the <body> after Selection.extend() from selection at start of the first text node of 'staticBefore' to start of the first text node of 'innerEditor'");
+test(function() {
+    resetFocusAndSelectionRange();
+    document.getSelection().extend(staticAfter.textNode, 0);
+    assert_equals(document.activeElement, document.body);
+    assert_equals(document.documentElement.scrollTop, 0);
+}, "Active element should be the <body> after Selection.extend() from selection at start of the first text node of 'staticBefore' to start of the first text node of 'staticAfter'");
+test(function() {
+    resetFocusAndSelectionRange();
+    document.getSelection().extend(anchor.textNode, 0);
+    assert_equals(document.activeElement, document.body);
+    assert_equals(document.documentElement.scrollTop, 0);
+}, "Active element should be the <body> after Selection.extend() from selection at start of the first text node of 'staticBefore' to start of the first text node of 'anchor'");
+
+test(function() {
+    resetFocusAndSelectionRange(editor);
+    document.getSelection().extend(editor.textNode, editor.textLength);
+    assert_equals(document.activeElement, editor.element);
+    assert_equals(document.documentElement.scrollTop, 0);
+}, "Active element should be 'editor' after Selection.extend() from selection at start of the first text node of 'editor' to end of the first text node of 'editor'");
+test(function() {
+    resetFocusAndSelectionRange(editor);
+    document.getSelection().extend(outerEditor.textNode, 0);
+    assert_equals(document.activeElement, editor.element);
+    assert_equals(document.documentElement.scrollTop, 0);
+}, "Active element should be 'editor' after Selection.extend() from selection at start of the first text node of 'editor' to start of the first text node of 'outerEditor'");
+test(function() {
+    resetFocusAndSelectionRange(editor);
+    document.getSelection().extend(innerEditor.textNode, 0);
+    assert_equals(document.activeElement, editor.element);
+    assert_equals(document.documentElement.scrollTop, 0);
+}, "Active element should be 'editor' after Selection.extend() from selection at start of the first text node of 'editor' to start of the first text node of 'innerEditor'");
+
+test(function() {
+    resetFocusAndSelectionRange(outerEditor);
+    document.getSelection().extend(outerEditor.textNode, outerEditor.textLength);
+    assert_equals(document.activeElement, outerEditor.element);
+    assert_equals(document.documentElement.scrollTop, 0);
+}, "Active element should be 'outerEditor' after Selection.extend() from selection at start of the first text node of 'outerEditor' to end of the first text node of 'outerEditor'");
+test(function() {
+    resetFocusAndSelectionRange(outerEditor);
+    document.getSelection().extend(staticInEditor.textNode, 0);
+    assert_equals(document.activeElement, outerEditor.element);
+    assert_equals(document.documentElement.scrollTop, 0);
+}, "Active element should be 'outerEditor' after Selection.extend() from selection at start of the first text node of 'outerEditor' to start of the first text node of 'staticInEditor'");
+test(function() {
+    resetFocusAndSelectionRange(outerEditor);
+    document.getSelection().extend(innerEditor.textNode, 0);
+    assert_equals(document.activeElement, outerEditor.element);
+    assert_equals(document.documentElement.scrollTop, 0);
+}, "Active element should be 'outerEditor' after Selection.extend() from selection at start of the first text node of 'outerEditor' to start of the first text node of 'innerEditor'");
+test(function() {
+    resetFocusAndSelectionRange(outerEditor);
+    document.getSelection().extend(editor.textNode, 0);
+    assert_equals(document.activeElement, outerEditor.element);
+    assert_equals(document.documentElement.scrollTop, 0);
+}, "Active element should be 'outerEditor' after Selection.extend() from selection at start of the first text node of 'outerEditor' to start of the first text node of 'editor'");
+
+test(function() {
+    resetFocusAndSelectionRange(innerEditor);
+    document.getSelection().extend(innerEditor.textNode, innerEditor.textLength);
+    assert_equals(document.activeElement, innerEditor.element);
+    assert_equals(document.documentElement.scrollTop, 0);
+}, "Active element should be 'innerEditor' after Selection.extend() from selection at start of the first text node of 'innerEditor' to end of the first text node of 'innerEditor'");
+test(function() {
+    resetFocusAndSelectionRange(innerEditor);
+    document.getSelection().extend(outerEditor.textNode, 0);
+    assert_equals(document.activeElement, outerEditor.element);
+    assert_equals(document.documentElement.scrollTop, 0);
+}, "Active element should be 'outerEditor' after Selection.extend() from selection at start of the first text node of 'innerEditor' to start of the first text node of 'outerEditor'");
+test(function() {
+    resetFocusAndSelectionRange(innerEditor);
+    document.getSelection().extend(staticInEditor.textNode, 0);
+    assert_equals(document.activeElement, outerEditor.element);
+    assert_equals(document.documentElement.scrollTop, 0);
+}, "Active element should be 'outerEditor' after Selection.extend() from selection at start of the first text node of 'innerEditor' to start of the first text node of 'staticInEditor'");
+test(function() {
+    resetFocusAndSelectionRange(innerEditor);
+    document.getSelection().extend(anchor.textNode, 0);
+    assert_equals(document.activeElement, innerEditor.element);
+    assert_equals(document.documentElement.scrollTop, 0);
+}, "Active element should be 'innerEditor' after Selection.extend() from selection at start of the first text node of 'innerEditor' to start of the first text node of 'anchor'");
+
+test(function() {
+    resetFocusAndSelectionRange(anchor);
+    document.getSelection().extend(anchor.textNode, anchor.textLength);
+    assert_equals(document.activeElement, anchor.element);
+    assert_equals(document.documentElement.scrollTop, 0);
+}, "Active element should be 'anchor' after Selection.extend() from selection at start of the first text node of 'anchor' to end of the first text node of 'anchor' and 'anchor' has focus before the call");
+test(function() {
+    resetFocusAndSelectionRange(anchor);
+    anchor.element.blur();
+    document.getSelection().extend(anchor.textNode, anchor.textLength);
+    assert_equals(document.activeElement, document.body);
+    assert_equals(document.documentElement.scrollTop, 0);
+}, "Active element should be the <body> after Selection.extend() from selection at start of the first text node of 'anchor' to end of the first text node of 'anchor' and 'anchor' doesn't have focus before the call");
+</script>