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diff --git a/dom/tests/mochitest/webcomponents/test_event_stopping.html b/dom/tests/mochitest/webcomponents/test_event_stopping.html
deleted file mode 100644
index c90988d869..0000000000
--- a/dom/tests/mochitest/webcomponents/test_event_stopping.html
+++ /dev/null
@@ -1,174 +0,0 @@
-<!DOCTYPE HTML>
-<html>
-<!--
-https://bugzilla.mozilla.org/show_bug.cgi?id=887541
--->
-<head>
-  <title>Test for event model in web components</title>
-  <script type="text/javascript" src="head.js"></script>
-  <script src="/tests/SimpleTest/SimpleTest.js"></script>
-  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
-</head>
-<body>
-<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=887541">Bug 887541</a>
-<script>
-
-var els = SpecialPowers.Cc["@mozilla.org/eventlistenerservice;1"]
-            .getService(SpecialPowers.Ci.nsIEventListenerService);
-
-SimpleTest.waitForExplicitFinish();
-createIframe()
-  .then((aDocument) => {
-    function eventListener(e) {
-      eventChain.push(this);
-    }
-
-    function isEventChain(actual, expected, msg) {
-      is(actual.length, expected.length, msg);
-      for (var i = 0; i < expected.length; i++) {
-        is(actual[i], expected[i], msg + " at " + i);
-      }
-
-      if (actual.length) {
-        var chain = els.getEventTargetChainFor(actual[0], false); // Events should be dispatched on actual[0].
-        ok(expected.length < chain.length, "There should be additional chrome event targets.");
-      }
-    }
-
-    /*
-     * <div elemOne> ------ <shadow-root shadowOne>
-     *                                 |
-     *                          <span elemTwo>
-     *                                 |
-     *                         <span elemThree>
-     */
-
-    var elemOne = aDocument.createElement("div");
-    var elemTwo = aDocument.createElement("span");
-    var elemThree = aDocument.createElement("span");
-    var shadowOne = elemOne.attachShadow({mode: "open"});
-
-    shadowOne.appendChild(elemTwo);
-    elemTwo.appendChild(elemThree);
-
-    // Test stopping "abort" event.
-
-    elemOne.addEventListener("abort", eventListener);
-    elemTwo.addEventListener("abort", eventListener);
-    elemThree.addEventListener("abort", eventListener);
-    shadowOne.addEventListener("abort", eventListener);
-
-    var eventChain = [];
-
-    var customEvent = new CustomEvent("abort", { "bubbles" : true });
-    elemThree.dispatchEvent(customEvent);
-    isEventChain(eventChain, [elemThree, elemTwo, shadowOne], "Test that abort event is stopped at shadow root.");
-
-    // Test stopping "error" event.
-
-    elemOne.addEventListener("error", eventListener);
-    elemTwo.addEventListener("error", eventListener);
-    elemThree.addEventListener("error", eventListener);
-    shadowOne.addEventListener("error", eventListener);
-
-    eventChain = [];
-
-    customEvent = new CustomEvent("error", { "bubbles" : true });
-    elemThree.dispatchEvent(customEvent);
-    isEventChain(eventChain, [elemThree, elemTwo, shadowOne], "Test that error event is stopped at shadow root.");
-
-    // Test stopping "select" event.
-
-    elemOne.addEventListener("select", eventListener);
-    elemTwo.addEventListener("select", eventListener);
-    elemThree.addEventListener("select", eventListener);
-    shadowOne.addEventListener("select", eventListener);
-
-    eventChain = [];
-
-    customEvent = new CustomEvent("select", { "bubbles" : true });
-    elemThree.dispatchEvent(customEvent);
-    isEventChain(eventChain, [elemThree, elemTwo, shadowOne], "Test that select event is stopped at shadow root.");
-
-    // Test stopping "change" event.
-
-    elemOne.addEventListener("change", eventListener);
-    elemTwo.addEventListener("change", eventListener);
-    elemThree.addEventListener("change", eventListener);
-    shadowOne.addEventListener("change", eventListener);
-
-    eventChain = [];
-
-    customEvent = new CustomEvent("change", { "bubbles" : true });
-    elemThree.dispatchEvent(customEvent);
-
-    // Test stopping "reset" event.
-
-    elemOne.addEventListener("reset", eventListener);
-    elemTwo.addEventListener("reset", eventListener);
-    elemThree.addEventListener("reset", eventListener);
-    shadowOne.addEventListener("reset", eventListener);
-
-    eventChain = [];
-
-    customEvent = new CustomEvent("reset", { "bubbles" : true });
-    elemThree.dispatchEvent(customEvent);
-    isEventChain(eventChain, [elemThree, elemTwo, shadowOne], "Test that reset event is stopped at shadow root.");
-
-    // Test stopping "load" event.
-
-    elemOne.addEventListener("load", eventListener);
-    elemTwo.addEventListener("load", eventListener);
-    elemThree.addEventListener("load", eventListener);
-    shadowOne.addEventListener("load", eventListener);
-
-    eventChain = [];
-
-    customEvent = new CustomEvent("load", { "bubbles" : true });
-    elemThree.dispatchEvent(customEvent);
-    isEventChain(eventChain, [elemThree, elemTwo, shadowOne], "Test that load event is stopped at shadow root.");
-
-    // Test stopping "resize" event.
-
-    elemOne.addEventListener("resize", eventListener);
-    elemTwo.addEventListener("resize", eventListener);
-    elemThree.addEventListener("resize", eventListener);
-    shadowOne.addEventListener("resize", eventListener);
-
-    eventChain = [];
-
-    customEvent = new CustomEvent("resize", { "bubbles" : true });
-    elemThree.dispatchEvent(customEvent);
-    isEventChain(eventChain, [elemThree, elemTwo, shadowOne], "Test that resize event is stopped at shadow root.");
-
-    // Test stopping "scroll" event.
-
-    elemOne.addEventListener("scroll", eventListener);
-    elemTwo.addEventListener("scroll", eventListener);
-    elemThree.addEventListener("scroll", eventListener);
-    shadowOne.addEventListener("scroll", eventListener);
-
-    eventChain = [];
-
-    customEvent = new CustomEvent("scroll", { "bubbles" : true });
-    elemThree.dispatchEvent(customEvent);
-    isEventChain(eventChain, [elemThree, elemTwo, shadowOne], "Test that scroll event is stopped at shadow root.");
-
-    // Test stopping "selectstart" event.
-
-    elemOne.addEventListener("selectstart", eventListener);
-    elemTwo.addEventListener("selectstart", eventListener);
-    elemThree.addEventListener("selectstart", eventListener);
-    shadowOne.addEventListener("selectstart", eventListener);
-
-    eventChain = [];
-
-    customEvent = new CustomEvent("selectstart", { "bubbles" : true });
-    elemThree.dispatchEvent(customEvent);
-    isEventChain(eventChain, [elemThree, elemTwo, shadowOne], "Test that selectstart event is stopped at shadow root.");
-
-    SimpleTest.finish();
-  });
-</script>
-</body>
-</html>