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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS通用选择器示例</title>
<style>
* {
margin: 0;
padding: 0;
}
</style>
</head>
<body>
<h1>This is heading</h1>
<p>This is a paragraph.</p>
</body>
</html>