diff --git a/node_modules/dialog-polyfill/tests/modal-dialog.html b/node_modules/dialog-polyfill/tests/modal-dialog.html
new file mode 100644
index 0000000..be98e91
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+++ b/node_modules/dialog-polyfill/tests/modal-dialog.html
@@ -0,0 +1,62 @@
+<!DOCTYPE html>
+<html tabindex="0">
+<meta charset='utf-8'>
+<head>
+<script src="../dist/dialog-polyfill.js"></script>
+<meta name="viewport" content="width=device-width, user-scalable=no">
+<link rel="stylesheet" type="text/css" href="../dist/dialog-polyfill.css">
+<style>
+  html {
+    border: 4px solid white;
+  }
+  html:focus {
+    border-color: red;
+  }
+dialog {
+  width: 100px;
+}
+</style>
+</head>
+<body>
+<p>Test for modal dialog. The test passes if you can click on "Click me" button,
+but can't click or tab to the "Can't click me!" button</p>
+<div id="console"></div>
+
+<input type="text" placeholder="Test 1" tabindex="1" />
+<input type="text" placeholder="Test 2" tabindex="2" />
+<input type="text" placeholder="Test 2.1" tabindex="2" />
+<input type="text" placeholder="Test 3" tabindex="3" />
+
+<input type="text" placeholder="Before dialog" />
+<dialog>
+  <button id="dialog-button">Click me</button>
+  <input type="text" placeholder="Focus me" />
+  <input type="text" placeholder="Focus me again" />
+</dialog>
+<button id="inert-button">Can't click me</button>
+<input type="text" placeholder="Can't focus me" />
+<script>
+function writeToConsole(s) {
+  var console = document.getElementById('console');
+  var span = document.createElement('span');
+  span.textContent = s;
+  console.appendChild(span);
+  console.appendChild(document.createElement('br'));
+}
+
+var dialog = document.querySelector('dialog');
+dialogPolyfill.registerDialog(dialog);
+dialog.showModal();
+
+var dialogButton = document.getElementById('dialog-button');
+dialogButton.addEventListener('click', function(e) {
+  writeToConsole("SUCCESS: dialog's button was clicked");
+});
+
+var inertButton = document.getElementById('inert-button');
+inertButton.addEventListener('click', function(e) {
+  writeToConsole('FAIL: inert button was clicked');
+});
+</script>
+</body>
+</html>