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Common pseudo-classes (pseudo-classes) and pseudo-elements (pseudo-elements)
Pseudo-Class:: Hover mouse on the effect
: Actiive effect after click
Pseudo element
: Before
: After
<!DOCTYPE HTML><HTMLLang= "en"><Head> <MetaCharSet= "UTF-8"> <title>Document</title> <styletype= "Text/css"> *{margin:0;padding:0; }ul{width:1000px;margin:0 Auto;Counter-reset:Li; }Li{List-style:None; }Ul>li{Background-color:#ccc;Margin-top:10px; }Ul>li:before{content:counter (LI);counter-increment:Li;Background-color:#333;Border-radius:100%;padding:0 5px;Color:#fff;Margin-right:10px; }. Test{width:200px;Height:200px;background:#000;Color:#fff; }. Test:before{content: " ";Color:Red;width:20px;Height:20px;background:#fff;float: Left; }. Test:after{content:" ";Color:Green;width:20px;Height:20px;background:#fff;float: Right; } </style></Head><Body><Divclass= "Test">hhhkjkkj</Div><ul> <Li>List Item One</Li> <Li>The second item on the list</Li> <Li>Number three is a bit longer, with some Lorem ipsum for good measure. Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqu A. Ut enim ad minim veniam, quis nostrud exercitation Ullamco laboris nisi Ut aliquip ex ea commodo consequat. Duis aute irure dolor in Reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur Sint Occaecat Cupidatat non proident, sunt in culpa qui officia deserunt mollit anim ID est laborum.</Li> <Li>And here are number four.</Li> <Li>The fifth item on the list</Li> <Li>The sixth item on the list</Li></ul></Body></HTML>
Clear float:
. clearfix{zoom:1;} . Clearfix:after {clear:both;content: '. '; Display:block;width:0;height:0;visibility:hidden;}About CSS pseudo-class selectors
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