Css3 inserts content on the page, and css3 inserts content on the page

Css3 inserts content on the page, and css3 inserts content on the page

A. Insert content using Selector

H2: before {

Content: "prefix ";

}

H2: after {

Content: "suffix ";

}

B. The specified element is not inserted.

H2.sample: before {

Content: none;

}

2.Insert Image

A. Insert an image file before the title

H2: before {

Content: url(anwy.jpg );

}

B. SetAltThe attribute value is displayed as the image title (not available)

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

Div: before {

Content: counter (divCounter );

}

Div {

Counter-increment: divCounter;

}

B. Append text to the project symbol

Div: before {

Content: "section" counter (divCounter ";

}

C. Id style and type

Div: before {

Content: counter (divCounter, upper-alpha )'.';

Color: blue;

Font-size: 16px;

}

D. Number nesting

Div: before {

Content: counter (divCounter, upper-alpha )'.';

Color: blue;

Font-size: 16px;

}

Div {

Counter-increment: divCounter;

Counter-reset: subDivCounter;

}

P: before {

Content: counter (subDivCounter )'.';

Margin-left: 15px;

 

Font-size: 12px;

}

P {

Counter-increment: subDivCounter;

}

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

H3: before {

Content: open-quote;

}

H3: after {

Content: close-quote;

}

H3 {

Quotes :"【""]";

}

 

Disc point | circle | square | decimal number | decimal-leading-zero decimal number | lower-roman lower case Rome text | upper-roman upper case Rome text | lower-greek lower case greek letter | lower-latin lowercase latin | upper-latin upper-case latin | armenian Armenia number | georgian Georgia number | lower-alpha lower-case English letter | upper-alpha upper-case English letter | none | inherit inheritance