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Test Info:

<html><head>
<meta http-equiv="content-type" content="text/html; charset=windows-1252"><style>
#a {
-webkit-mask: url(data:image/gif;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=);
clip: rect(8px, 68px, 1px, 1px);
}
* {
position: fixed;
}
</style>
<script>
window.onload = () => {
a.show()
}
</script>
</head><body><dialog id="a" open="">
<font>x</font>
</dialog></body></html>