How to insert content into the page in css3

A． Use selectors to insert content

h2:before{
　　content:"前缀";
}
h2:after{
　　content:"后缀";
}

B. Specify individual elements not to be inserted

h2.sample:before{
　　content:none;
}

2. Insert images

A． Insert image file before the title

h2:before{
　　content:url(anwy.jpg);
}

B． Display the value of the alt attribute as the title of the image (cannot be used)

img:after{
　　content:attr(alt);
　　display:block;
　　text-align:center;
　　margin-top:5px;
　　font-size:11px;
　　font-weight:bold;
　　color:black;
}

3. Insert number

A． Add consecutive numbers before multiple titles

p:before{
　　content:counter(pCounter);
}
p{
　　counter-increment:pCounter;
}

B． Append text to bullets

p:before{
　　content:"第"counter(pCounter)"段";
}

C． Specify numbering style and type

p:before{
　　content:counter(pCounter,upper-alpha)'.';
　　color:blue;
　　font-size:16px;
}

D． Number nesting

p:before{
　　content:counter(pCounter,upper-alpha)'.';
　　color:blue;
　　font-size:16px;
}
p{
　　counter-increment:pCounter;
　　counter-reset:subDivCounter;
}
p:before{
　　content:counter(subDivCounter)'.';
　　margin-left:15px;
 
　　font-size:12px;
}
p{
　　counter-increment:subDivCounter;
}

E． Add text nesting symbols on both sides of the string

h3:before{
　　content: open-quote;
}
h3:after{
　　content: close-quote;
}
h3{
　　quotes:"【""】";
}

disc Point| circlecircle | squaresquare | decimalnumber | decimal-leading-zero decimal number| lower-roman lowercase Roman text| upper-roman uppercase Roman script| lower-greeklower case Greek letter | lower-latinlowercase Latin | upper-latin uppercase Latin| armenianArmenia Number | georgianGeorgian number | lower-alphalowercaseEnglish letter | upper-alphauppercaseEnglish letter | none无 | inheritinherit

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