css_ID选择器
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="Generator" content="EditPlus®">
<meta name="Author" content="">
<meta name="Keywords" content="">
<meta name="Description" content="">
<title>css_ID选择器</title>
<style type="text/css">
#tag01{color: red;}
</style>
</head>
<body>
<p id="tag01">我是段落</p>
</body>
</html>
