1: Tag selector

The tag selector is effective for all tags with a certain tag. Here we take p as an example, that is, everything marked with p will have this style

< head>

p{font:"宋体"; color:#FF0000}

What I am showing now is the tag selector

I am also using the tag selector

I am not modified by any selector

2: id selector , note that the id selector is unique, because only id="yy" has this style, and the ID of an element in a page must be unique, so . . . Do you know that the id selector starting with # is: id=""

< head>

#yy{font:"宋体"; color:#FF0000}

What I am showing now is the id selector

I am not modified by the id selector

I am not modified by any selector

3: Class selector , the class selector starts with . Just put the class="" of the element to display this style. The usage is: class=""

< head>

.yy{font:"宋体"; color:#FF0000}

What I am showing is the class selector

I am not modified by the class selector

I am not modified by any selector