frame-before-load.html - Android社区 - https://www.androidos.net.cn/

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<script src="resources/print.js"></script>
</head>
<body>
<div id="console"></div>
<script>
if (window.layoutTestController) {
    layoutTestController.dumpAsText();
}
</script>

<iframe style="display:none" onbeforeload="print('PASS', 'green'); return event.url != 'http://www.daringfireball.net/';" onload="print('FAIL', 'red');" src="http://www.daringfireball.net/">
</iframe>

</body>
</html>