gecko-dev/layout/forms/crashtests/1102791.html

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HTML

<!DOCTYPE HTML>
<html class="reftest-print"><head>
<meta charset="utf-8">
<title>Testcase for bug 1102791</title>
<style type="text/css">
html,body {
color:black; background-color:white; font-size:16px; padding:0; margin:0;
}
button {
position: absolute;
-moz-appearance: none;
background: transparent;
padding: 0;
border-style:none;
}
button::before {
position: absolute;
content: "::before";
width: 10px;
height: 200em;
border: 1px solid black;
}
</style>
</head>
<body>
<button></button>
</body>
</html>