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<!-- Any copyright is dedicated to the Public Domain.
<html>
<head>
<title>variables test</title>
<style>
:root {
--10: 10px;
---blue: blue;
}
#a {
font-size: var(--10);
}
#b {
color: var(---blue);
}
</style>
</head>
<body>
<div id="a">A</div><br>
<div id="b">B</div>
</body>
</html>