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diff --git a/dom/events/test/test_bug1264380.html b/dom/events/test/test_bug1264380.html
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index 0000000000..9349e9712f
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+++ b/dom/events/test/test_bug1264380.html
@@ -0,0 +1,82 @@
+<html>
+<head>
+  <title>Test the dragstart event on the anchor in side shadow DOM</title>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css">
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="/tests/SimpleTest/EventUtils.js"></script>
+<script>
+
+async function runTests()
+{
+  let dragService = SpecialPowers.Cc["@mozilla.org/widget/dragservice;1"].
+    getService(SpecialPowers.Ci.nsIDragService);
+
+  let iframe = document.querySelector("iframe");
+  let iframeDoc = iframe.contentDocument;
+  let iframeWin = iframe.contentWindow;
+
+  let shadow = iframeDoc.querySelector('#outer').attachShadow({mode: 'open'});
+
+  let target = iframeDoc.createElement('a');
+  target.textContent = "Drag me if you can!";
+  const URL = "http://www.mozilla.org/";
+  target.href = URL;
+  shadow.appendChild(target);
+
+  // Some of the drag data we don't actually care about for this test,
+  // so we'll use this comparator function to ignore them.
+  function ignoreFunc(actualData, expectedData) {
+    return true;
+  }
+
+  const EXPECTED_DRAG_DATA = [[{
+    type: "text/x-moz-url",
+    data: "",
+    eqTest: ignoreFunc,
+  }, {
+    type: "text/x-moz-url-data",
+    data: "",
+    eqTest: ignoreFunc,
+  }, {
+    type: "text/x-moz-url-desc",
+    data: "",
+    eqTest: ignoreFunc,
+  }, {
+    type: "text/uri-list",
+    data: URL,
+  }, {
+    type: "text/_moz_htmlinfo",
+    data: "",
+    eqTest: ignoreFunc,
+  }, {
+    type: "text/html",
+    data: "",
+    eqTest: ignoreFunc,
+  }, {
+    type: "text/plain",
+    data: URL,
+  }]];
+
+  let result = await synthesizePlainDragAndCancel(
+    {
+      srcElement: target,
+      srcWindow: iframeWin,
+      finalY: -10,  // Avoid clicking the link
+    },
+    EXPECTED_DRAG_DATA);
+  ok(result === true, "Should have gotten the expected drag data.");
+  SimpleTest.finish();
+}
+
+
+SimpleTest.waitForExplicitFinish();
+window.onload = () => {
+  SimpleTest.waitForFocus(runTests);
+};
+
+</script>
+
+<body>
+  <iframe srcdoc='<div id="outer"/>'></iframe>
+</body>
+</html>