What is the function of pseudo elements in css

Pseudo elements can be used to add some special effects to selectors.

(Recommended tutorial: css quick start)

Grammar:

selector:pseudo-element {property:value;}

Example:

1, "first-line" Pseudo elements are used to set special styles to the first line of text.

In the following code, the browser will format the first line of text of the p element according to the style in the "first-line" pseudo-element:

p:first-line {
    color:#ff0000;    
    font-variant:small-caps;
    }

Note: "first-line" Pseudo-elements can only be used with block-level elements.

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

p:first-letter {
    color:#ff0000;    
    font-size:xx-large;
    }

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