<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
* {
margin: 0;
padding: 0;
}
</style>
</head>
<body>
<p>pppp</p>
<p>pppp</p>
<h1>h1</h1>
<ul>
<li>lili</li>
</ul>
</body>
</html>html+css实战105-清除默认的内外边距
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