CSS pseudo-elements

CSS Pseudo Elements

CSS pseudo elements are used to add some special effects to selectors.

Syntax

Pseudo-element syntax:

selector:pseudo-element {property:value;}

CSS classes can also use pseudo-elements:

selector.class:pseudo-element {property:value;}

:first-line pseudo-element

"first-line" pseudo-element is used to add to the first line of text Set special styles.

Note: The "first-line" pseudo-element can only be used for block-level elements.

Note: The following properties can be applied to the "first-line" pseudo-element:

font properties

color properties

background properties

word-spacing

letter-spacing

text-decoration

vertical-align

text-transform

line-height

clear

:first-letter pseudo-element

The "first-letter" pseudo-element is used to set a special style to the first letter of text

Note: The "first-letter" pseudo-element can only be used for block-level elements.

Note: The following properties can be applied to the "first-letter" pseudo-element:

font properties

color properties

background properties

margin properties

padding properties

border properties

text-decoration

vertical-align (only if "float" is "none")

text-transform

line-height

float

clear

Pseudo-elements and CSS classes

Pseudo elements can be combined with CSS classes:

p.article:first-letter {color:#ff0000;}

<p class="article ">A paragraph in an article</p>

The above example will make the first letter of all paragraphs with class article turn red.

Multiple Pseudo-elements

Can be used in combination with multiple pseudo-elements.

In the example below, the first letter of the paragraph will be displayed in red and its font size will be xx-large. The rest of the text in the first line will be blue and appear in small caps.

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<title>php中文网</title> 
<style>
p:first-letter
{
color:#ff0000;
font-size:xx-large;
}
p:first-line 
{
color:#0000ff;
font-variant:small-caps;
}
</style>
</head>
<body>
<p>You can combine the :first-letter and :first-line pseudo-elements to add a special effect to the first letter and the first line of a text!</p>
</body>
</html>

CSS - :before pseudo-element

":before" pseudo-element can insert new content before the content of the element.

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS ::before 伪元素示例</title>
<style type="text/css" media="all">
div::before
{
background: lightgreen;
content: "张三";
}
</style>
</head>
<body>
<div>今天来学习知识</div>
</body>
</html>

CSS - :after pseudo-element

":after" pseudo-element can insert new content after the content of the element.

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS ::after 伪元素示例</title>
<style type="text/css" media="all">
div::after
{
background: lightgreen;
content: "周末";
}
</style>
</head>
<body>
<div>今天是</div>
</body>
</html>

Continuing Learning

new file

<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>CSS ::before 伪元素示例</title> <style type="text/css" media="all"> div::before { background: lightgreen; content: "张三"; } </style> </head> <body> <div>今天来学习知识</div> </body> </html>

submit Reset Code

Automatic operation

CSS pseudo-elements

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