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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>HTML Test: the browsing contexts must be sorted in the order that their containers were inserted into the Document</title>
+<link rel="author" title="Intel" href="http://www.intel.com/" />
+<link rel="help" href="https://html.spec.whatwg.org/multipage/multipage/browsers.html#accessing-other-browsing-contexts" />
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+
+var t1 = async_test("The window's length must return the number of child browsing contexts(in iframe)");
+function on_load1(fr) {
+  t1.step(function () {
+    var doc = fr.contentDocument;
+    var fr3 = doc.createElement("iframe");
+    fr3.setAttribute("id", "fr3");
+    doc.body.insertBefore(fr3, doc.getElementById("tbl"));
+
+    assert_equals(fr.contentWindow.length, 3, "The window.length should be 3.");
+    assert_array_equals([fr.contentWindow[0].frameElement, fr.contentWindow[1].frameElement, fr.contentWindow[2].frameElement],
+                        [fr.contentDocument.getElementById("fr4"), fr.contentDocument.getElementById("fr5"), fr.contentDocument.getElementById("fr3")],
+                        "The child browsing contexts must be sorted in the order that their containers were inserted into the Document.");
+  });
+  t1.done();
+}
+
+var t2 = async_test("The window's length must return zero if it has no child browsing context");
+function on_load2(fr) {
+  t2.step(function () {
+    assert_equals(fr.contentWindow.length, 0, "The window.length should be 0.");
+  });
+  t2.done();
+}
+
+</script>
+<iframe id="fr1" src="test1.html" style="display:none" onload="on_load1(this)"></iframe>
+<iframe id="fr2" src="test2.html" style="display:none" onload="on_load2(this)"></iframe>
+<script>
+
+test(function () {
+  assert_equals(window.length, 2, "The window.length should be 2.");
+  assert_array_equals([window[0].frameElement, window[1].frameElement],
+                      [document.getElementById("fr1"), document.getElementById("fr2")],
+                     "The child browsing contexts must be sorted in the tree order.");
+}, "The window's length must return the number of child browsing contexts");
+
+</script>