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diff --git a/testing/web-platform/tests/dom/ranges/Range-commonAncestorContainer.html b/testing/web-platform/tests/dom/ranges/Range-commonAncestorContainer.html
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+++ b/testing/web-platform/tests/dom/ranges/Range-commonAncestorContainer.html
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+<!doctype html>
+<title>Range.commonAncestorContainer tests</title>
+<link rel="author" title="Aryeh Gregor" href=ayg@aryeh.name>
+<meta name=timeout content=long>
+<div id=log></div>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../common.js></script>
+<script>
+"use strict";
+
+testRanges.unshift("[detached]");
+
+for (var i = 0; i < testRanges.length; i++) {
+ test(function() {
+ var range;
+ if (i == 0) {
+ range = document.createRange();
+ range.detach();
+ } else {
+ range = rangeFromEndpoints(eval(testRanges[i]));
+ }
+
+ // "Let container be start node."
+ var container = range.startContainer;
+
+ // "While container is not an inclusive ancestor of end node, let
+ // container be container's parent."
+ while (container != range.endContainer
+ && !isAncestor(container, range.endContainer)) {
+ container = container.parentNode;
+ }
+
+ // "Return container."
+ assert_equals(range.commonAncestorContainer, container);
+ }, i + ": range " + testRanges[i]);
+}
+
+testDiv.style.display = "none";
+</script>