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What are the css selectors? Summary of css selector usage
- 不言Original
- 2018-08-18 14:40:022036browse
This article brings you what are the css selectors? A summary of the use of CSS selectors has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.
1. Selector (device) uses basic syntax
Selector { Attribute 1: Attribute value 1;
Attribute 2: Attribute value 2;
Attribute 3: Attribute value 3;
…..: …….;
}
2. Tag selector (directly use HTML tags as selectors)
second.html
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>标记选择器</title>
<link href="second.css" type="text/css" rel="stylesheet">
</head>
<body>
<p> 标记选择器(直接使用html标签做选择器)</p>
</body>
</html>second.css
p{
font-size:34px;
text-align:left;
text-transform:uppercase;
font-family:黑体,宋体;
text-indent:3em;
text-decoration:line-through;
font-weight:bolder;
letter-spacing:0.5em;
line-height:3px;
margin:34px;
padding:23px;
}3. Class selector (for each The label sets a class name. CSS can set the style of the label through the class name. Different labels can have the same class name, and they can share the same style.) - In CSS, label name.class name or .class name is used to express
second.html
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>类选择器</title>
<link href="second.css" type="text/css" rel="stylesheet">
</head>
<body>
<p class="text"> 类选择器(为每一个标签设置一个类名，CSS可通过类名为标签设置样式，不同标签类名可以相同，
相同可以共用同一个样式)---CSS中用标签名.类名或者.类名表示 </p>
</body>
</html>second.css
.text{
font-variant:small-caps;/*小型大写字母*/
font-family:宋体,黑体;
font-style:italic;
text-transform:lowercase;
font-size:35px;
text-indent:3em;
text-decoration:overline;
font-weight:bold;
letter-spacing: 1px;
line-height:3em;
font-variant:small-caps;
text-align:right;
}4.ID selector (set a unique ID for each HTML tag, CSS can set the style for the tag through the id)
——#id value { } is used in CSS to represent
second.html
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>ID选择器</title>
<link href="second.css" type="text/css" rel="stylesheet">
</head>
<body>
<p class="text" id="textp1"> ID选择器(为每一个HTML标签设置一个唯一的ID，CSS可以通过id来为标签设置样式)
----CSS中用#id值{ }来表示 </p>
</body>
</html>second.css
.text{
font-variant:small-caps;/*小型大写字母*/
font-family:宋体,黑体;
font-style:italic;
text-transform:lowercase;
font-size:35px;
text-indent:3em;
text-decoration:overline;
}
#textp1{
font-weight:bold;
letter-spacing: 1px;
line-height:3em;
font-variant:small-caps;
text-align:right;
}5. Contains selectors (descendant selectors: can span generation, cross tags): Contain another tag in one tag
second.html
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>包含选择器</title>
<link href="second.css" type="text/css" rel="stylesheet">
</head>
<body>
<p class="text" id="textp1"> <a href="#" class="link">ID选择器</a>
(为每一个html标签设置一个唯一的ID，CSS可以通过id来为标签设置样式)
----CSS中用#id值{ }来表示 </p>
</body>
</html>second.css
p a{
text-decoration:none;
font-size:25px;
background-color:pink;
}
.text{
font-size:21px;
font-style:normal;
text-transform:lowercase;
text-indent:3em;
font-weight:bold;
letter-spacing:0.7em;
line-height:27px;
}6. Sub-selector (not supported by IE browser): No other tags can be included in the middle; in CSS, tag 1 > tag 2 (sub-tag) is used to represent
second.html
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>子选择器</title>
<link href="second.css" type="text/css" rel="stylesheet">
</head>
<body>
<p class="text" id="textp1">
<a href="#" class="link">子选择器</a>
（IE浏览器不支持）：中间不能包含其他标签；CSS中 标签1 >标签2（子标签） 表示
</p>
</body>
</html>second.css
p>a{
text-decoration:none;
font-family:黑体，宋体;
}
p{
font-size: 23px;
}7. Adjacent Selector: (CSS style is applied to the last tag) Commonly used to set column attributes of the table – CSS uses tag 1….Tag n represents
second.html
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>相邻选择器</title>
<link href="second.css" type="text/css" rel="stylesheet">
</head>
<body>
<p class="text" >
子选择器:
（IE浏览器不支持）：中间不能包含其他标签；CSS中 标签1 >标签2（子标签） 表示
</p>
<p class="text1">
相邻选择器(CSS样式作用在最后一个标签)常用设置表格的列属性--CSS用标签1+....标签n表示 </p>
</body>
</html>second.css
.text+.text1{
color:pink;
background-color:gray;
font-size:34px;
}8. Union selector: Set styles for multiple tags together, separated by commas
second.css
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>并集选择器</title>
<link href="second.css" type="text/css" rel="stylesheet">
</head>
<body>
<p class="text" >
子选择器:
（IE浏览器不支持）：中间不能包含其他标签；CSS中 标签1 >标签2（子标签） 表示
</p>
<p class="text1">
并集选择器:多个标签一起设置样式，用逗号隔开 </p>
</body>
</html>second.css
.text,.text1{
color:pink;
background-color:gray;
font-size:34px;}9. Pseudo class (a certain state of an element, often used to describe the state of a hyperlink: link (unvisited state); visited (visited state); hover (mouse passing state); active (clicking state) CSS tags Name: Status representation
second.html
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>伪类</title>
<link href="second.css" type="text/css" rel="stylesheet">
</head>
<body>
<a href="" class="a1">伪类</a>
</body>
</html>second.css
a:link {
color:blue;
font-size:53px;
text-decoration: none;
}
a:visited {
color:red;
font-size:193px;
}
a:hover {
color:green;
font-size:73px;
}
a:active {
color:gray;
font-size:183px;
} 10. Pseudo element (state of an element in an object) tag name in CSS : Pseudo-class representation
Commonly used ones are (first-letter [acts on the first letter of text], first-line [acts on the first line of text])
second.html
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>伪类</title>
<link href="second.css" type="text/css" rel="stylesheet">
</head>
<body>
<p>伪元素(某个对象中某个元素的状态)CSS中用标签名：
伪元素常用的有(first-letter[作用于文字首字]，first-line[作用于文字首行])
<br>伪元素(某个对象中某个元素的状态)CSS中用标签名：
伪元素常用的有(first-letter[作用于文字首字]，first-line[作用于文字首行]) </p>
</body>
</html>second.css
p:first-letter{
font-size:200%;
}
p:first-line{
color:red;
}11 Style priority: Inline selector>ID selector>Class selector (pseudo-class, attribute)>Mark selector
You can use !important; to increase the priority
Related recommendations:
css class selector and id selector
##CSS descendant selector and multi-class selector
css tag selector, id selector, class selector instance
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