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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1648877
+-->
+<head>
+ <title>Test for Bug 1648877</title>
+ <script src="/tests/SimpleTest/SimpleTest.js"></script>
+ <script src="/tests/SimpleTest/EventUtils.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=1648877">Requesting
+ fullscreen a dialog element should be denied</a>
+<p id="display"></p>
+<dialog>
+</dialog>
+<div style="width: 30px; height:30px" </div>
+
+<pre id="test">
+<script type="application/javascript">
+SimpleTest.waitForExplicitFinish();
+
+function runTest() {
+ document.addEventListener("fullscreenchange", () => {
+ ok(false, "Should never receive " +
+ "a fullscreenchange event in the main window.");
+ });
+
+ document.addEventListener('fullscreenerror', (event) => {
+ ok(!document.fullscreenElement,
+ "Should not grant request if the element is dialog");
+ SimpleTest.finish();
+ });
+
+ const div = document.querySelector("div");
+
+ div.addEventListener("click", function() {
+ const dialog = document.querySelector("dialog");
+ dialog.requestFullscreen();
+ });
+
+ synthesizeMouseAtCenter(div, {});
+}
+
+SimpleTest.waitForFocus(runTest);
+
+</script>
+</pre>
+</body>
+</html>