type class id选择器

type选择器

   h9{color:red}

this

class选择器

not green
very green
pppp

not green
方方正正very green
pppp

id选择器

    
    


宽了吧
试试宽不宽

伪类

    
    /*伪类*/

the last p before the note

the last p before the note
the last p before the note
the last p before the note

    
    

external links
the last p before the note

the last p before the note
the last p before the note
the last p before the note

动态伪类

    
    

external links
the last p before the note

the last p before the note
the last p before the note
the last p before the note