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Test Info:

<html>
<head>
<style>
#s2::before {
content: "a";
position: absolute;
}
#s1 {
overflow: clip;
}
#s3 {
position: relative;
}
#s5 {
position: absolute;
}
</style>
</head>
<body>
<strike id="s1">
<strike id="s2">
<small id="s3">
<div>
<div id="s4"></div>
</strike>
</div>
</body>
</html>