what is &mdash in html
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<!DOCTYPE html>
<html>
<style>
body {
font-size: 20px;
}
</style>
<body>
<span style='font-size:100px;'>—</span>
<p>I will display —</p>
<p>I will display —</p>
<p>I will display —</p>
</body>
</html>
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