Special characters in CSS

1. For example, div {...} adds a style to all <div> </div> .

2. "#": Corresponds to the ID attribute of the tag in HTML, written as # Name . For example, # P1 {...} adds a style to <p id = "p1"> ID is P1 </P>. .

3. The first decimal point ".": corresponds to the class attribute of the tag in HTML, written as. Name . For example,. P2 {...} adds a style to <P class = "p2"> class is P2 </P>. .

4. The intermediate space "" is related to the HTML Tag hierarchy. It is written as CSS [CSS [... CSS] and can be set to multiple layers. . For example, div # P1. span1 {...}

the most internal span1 in

add sample .

the CSS written in this way must strictly abide by the CSS and HTML Tag layers. In the following cases, this CSS will not apply :

<Div> <SPAN class = "span1"> </span> </div>

5. Comma "," indicates the parallel relationship, That is The CSS has multiple names (the CSS style can be simplified and repeated)

such as body, form, div {...} adds a style for all ,

, and

6. colon after name": ": generally, status

For example,: hover indicates the style used when the mouse is hovering over a tag

7. the dot in the style represents the class, # represents the ID, you can also comment out

H1 indicates the elements in HTML

tr. HR indicates the child element of the element

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