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css---6伪元素选择器

after :在内容后边

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>after</title>
<style type="text/css">
div {
     300px;
    height: 100px;
    border: 1px solid #000;
}
div::after {
    content: "我在内容的后面";
}
</style>
</head>
<body>
<div>伪元素fgdddddddddddddddddddddddddddddd</div>
</body>
</html>

content after

before 在内容的前面

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>before</title>
<style type="text/css">
div {
     300px;
    height: 100px;
    border: 1px solid #000;
}
div::before {
    content: "我在内容的前面";
}
</style>
</head>
<body>
<div>伪元素</div>
</body>
</html>

content before

First-Lette 第一个字母

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>First-Letter</title>
<style type="text/css">
div {
     500px;
    margin: 0 auto;
    font-size: 12px;
}
div::first-letter {
    color: #f00;
    font-size: 24px;
    font-weight: bold;
}
</style>
</head>
<body>
    <div>sssss</div>
</body>
</html>

View Code

First-Line 全部一行

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>First-Line</title>
<style type="text/css">
div {
     500px;
    margin: 0 auto;
}
div::first-line {
    color: #f00;
    font-weight: bold;
}
</style>
</head>
<body>
<div>
    sssss<br>
    sssss<br>
    sssss<br>
</div>
</body>
</html>

first Line

::selection 选择颜色会变

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Selection</title>
<style type="text/css">
div::selection {
    background: red;
    color: pink;
}
</style>
</head>
<body>
<div>SelectionSelectionSelectionSelectionSelectionSelectionSelectionSelectionSelectionSelectionSelectionSelectionSelectionSelectionSelectionSelectionSelectionSelectionSelectionSelectionSelectionSelectionSelectionSelectionSelectionSelectionSelectionSelectionSelectionSelectionSelectionSelectionSelectionSelectionSelection</div>
</body>
</html>

View Code

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原文地址：https://www.cnblogs.com/hack-ing/p/11764234.html