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diff --git a/testing/web-platform/tests/html/editing/dnd/platform/interrupt/004.html b/testing/web-platform/tests/html/editing/dnd/platform/interrupt/004.html
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index 0000000000..41492fe992
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+++ b/testing/web-platform/tests/html/editing/dnd/platform/interrupt/004.html
@@ -0,0 +1,31 @@
+<!doctype html>
+<title>File drag during prompt for upload</title>
+<style>
+  body > div {
+    height: 200px;
+    width: 200px;
+    background-color: orange;
+    display: inline-block;
+  }
+</style>
+<script type="text/javascript">
+window.onload = function () {
+  var orange = document.getElementsByTagName('div')[0];
+  orange.ondragenter = orange.ondragover = function (e) {
+    e.preventDefault();
+  };
+  orange.ondrop = function (e) {
+    e.preventDefault();
+    document.getElementsByTagName('ol')[0].innerHTML = ( e.dataTransfer.files[0] && e.dataTransfer.files[0].name == 'pass.txt' ) ? 'PASS' : 'FAIL';
+  };
+};
+</script>
+<div draggable="true"></div>
+
+<ol>
+  <li>Save <a href="pass.txt">pass.txt</a> and <a href="fail.txt">fail.txt</a> onto your computer.</li>
+  <li>Drag pass.txt from your computer onto the orange square.</li>
+  <li>A prompt should appear. Do not dismiss it. If a prompt does not appear, ignore any further steps, and check the tests in ../../file/</li>
+  <li>Drag fail.txt from your computer onto a blank part of this page. Fail if this page is replaced.</li>
+  <li>Accept the prompt. Fail if nothing happens.</li>
+</ol>