Selector: which tag to operate on
basic selector
Tag selector
Use the tag name as the name of the selector.
This example sets different font and background colors for different labels.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>css基本选择器一</title>
<style type="text/css" >
div{
background-color: yellow;
color: blue;
}
p{
background-color: red;
color: gray;
}
</style>
</head>
<body>
<div>hjwblog.com</div>
<p>hjwblog.com</p>
</body>
</html>class selector
Each html tag has a class attribute
You can use 标签名.类名{}the format setting for the specified class in the specified tag
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>css基本选择器二</title>
<style type="text/css" >
div.hjw{
background-color: black;
color: red;
}
</style>
</head>
<body>
<div class="hjw">hjwblog.com</div>
</body>
</html>This can be done by .类名{}specifying the format of different tags with the same class name.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>css基本选择器二</title>
<style type="text/css" >
.hjw{
background-color: black;
color: red;
}
</style>
</head>
<body>
<div class="hjw">hjwblog.com</div>
<p class="hjw">hjwblog.com</p>
</body>
</html>id selector
Each html tag has an attribute on itid
Use 标签名#id{}to format the content of the specified id under the specified tag
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>css基本选择器三</title>
<style type="text/css" >
div#hjw{
background-color: yellow;
color: red;
}
</style>
</head>
<body>
<div id="hjw">hjwblog.com</div>
</body>
</html>Use #id名{}to format all labels with the specified id.