<!DOCTYPE html>
<html>
<head>
<title>test</title>
<style type="text/css"> .red{
color: red;
} .red.big{
font-size: 20em;
} .red#small{
font-size: 1em;
}
</style>
</head>
<body>
<h1 class="red ok big" id="small">你好!</h1>
</body>
</html>
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