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diff --git a/testing/web-platform/tests/html/editing/dnd/platform/interrupt/003.html b/testing/web-platform/tests/html/editing/dnd/platform/interrupt/003.html
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+++ b/testing/web-platform/tests/html/editing/dnd/platform/interrupt/003.html
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+<!doctype html>
+<title>Interrupted drag with second in-document drag attempt</title>
+<style>
+  body > div {
+    height: 200px;
+    width: 200px;
+    background-color: orange;
+    display: inline-block;
+  }
+  body > div + div {
+    background-color: navy;
+  }
+  body > div + div + div {
+    background-color: yellow;
+  }
+  body > div + div + div + div {
+    background-color: fuchsia;
+  }
+</style>
+<script type="text/javascript">
+window.onload = function () {
+  var orange = document.getElementsByTagName('div')[0], blue = document.getElementsByTagName('div')[1], yellow = document.getElementsByTagName('div')[2], fuchsia = document.getElementsByTagName('div')[3];
+  orange.ondragstart = function (e) {
+    e.dataTransfer.setData('text','PASS');
+    e.dataTransfer.effectAllowed = 'all';
+  };
+  yellow.ondragstart = function (e) {
+    e.dataTransfer.setData('text','FAIL');
+    e.dataTransfer.effectAllowed = 'all';
+  };
+  blue.ondragenter = function (e) {
+    alert('JS alert');
+  };
+  fuchsia.ondragenter = fuchsia.ondragover = function (e) {
+    e.preventDefault();
+  };
+  fuchsia.ondrop = function (e) {
+    document.getElementsByTagName('ol')[0].textContent = e.dataTransfer.getData('text');
+    e.preventDefault();
+  };
+};
+</script>
+<div draggable="true"></div>
+<div></div>
+<div draggable="true"></div>
+<div></div>
+
+<ol>
+  <li>Open this page in two separate tabs, and start on tab #1.</li>
+  <li>Drag the orange square over the blue square.</li>
+  <li>An alert may appear. Do not dismiss it. If an alert does not appear, PASS, and ignore any further steps.</li>
+  <li>Click the other tab to focus it (or focus it in whatever way works). If you cannot change tabs, PASS, and ignore any further steps.</li>
+  <li>On tab #2, drag the yellow square over the blue square. If you cannot drag the yellow square, PASS, and ignore any further steps.</li>
+  <li>An alert may appear. Do not dismiss it.</li>
+  <li>Return to tab #1.</li>
+  <li>Dismiss the alert without using the left mouse button (eg. use keyboard, or mouse gestures such as gesture-down,gesture-right).</li>
+  <li>Do a short drag and drop within the pink square. If nothing happens, PASS, and ignore any further steps.</li>
+  <li>The word &quot;PASS&quot; should appear in place of this text.</li>
+</ol>