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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1640766
+-->
+<head>
+ <title>Test for Bug 1640766</title>
+ <script src="/tests/SimpleTest/SimpleTest.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=1640766">Mozilla Bug 1640766</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 1640766 **/
+
+function waitForMessage(aMsg) {
+ return new Promise((aResolve) => {
+ window.addEventListener("message", function handler(e) {
+ if (e.data != aMsg) {
+ return;
+ }
+
+ info(`receive: ${e.data}`);
+ window.removeEventListener("message", handler);
+ aResolve(e.source);
+ });
+ });
+}
+
+async function testSuspend(aWindow) {
+ let timerRan = false;
+ let timer = aWindow.setTimeout(function() {
+ timerRan = true;
+ }, 0);
+
+ return new Promise((aResolve) => {
+ setTimeout(function() {
+ ok(!timerRan, "timer should not run as the window is suspended");
+ clearTimeout(timer);
+ aResolve();
+ }, 0);
+ });
+}
+
+add_task(async function() {
+ let w = window.open("iframe1_bug1640766.html");
+ let inner = await waitForMessage("ready");
+
+ var utils = SpecialPowers.getDOMWindowUtils(w);
+ utils.enterModalState();
+
+ await testSuspend(w);
+ await testSuspend(inner);
+
+ utils.leaveModalState();
+ w.close();
+});
+
+</script>
+</pre>
+</body>
+</html>