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1, CSS is cascading style sheet abbreviation, Chinese meaning: Cascading style sheet.
CSS allows web page creators to effectively customize and improve the effect of web pages. CSS is a complement to HTML
CSS enables a complete separation of Web content and page effects
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2, CSS several ways to set up
There are three ways to add style sheets to an HTML document, each with its own pros and cons
1), inline style sheet (sets the style of the element within the tag)
2), embed style sheet (need to write in head tag <style type= "Text/css" ></style>)
3), external style sheet link
<!DOCTYPE HTML><HTMLxmlns= "http://www.w3.org/1999/xhtml"><Head><Metahttp-equiv= "Content-type"content= "text/html; charset=utf-8"/> <title></title> <Linkhref= "Testcss.css"rel= "stylesheet" /> <styletype= "Text/css">P{background:Yellow;font-size:Xx-small; } </style></Head><Body> <Pstyle= "background:red; Font-size:xx-large">The weather is fine today, the steamer is everywhere.</P> <P>The weather is fine today, the steamer is everywhere.</P> <P>The weather is fine today, the steamer is everywhere.</P> <P>The weather is fine today, the steamer is everywhere.</P> <TT>The moonlight before the bed, suspected to be ground frost</TT></Body></HTML>
3. Style Rule selector (what is the way to get the elements on the page to set the style)
1), HTML Selector
2), Class Selector (you need to assign a value to the class property of the element you want to set the style to)
3), ID Selector (need to assign a value to the id attribute of the element to set the style)
4), association selector Pem{background-color:yellow}
5), combination selector <table></table>
6), pseudo-element selector
A pseudo-element selector is a way of defining the various states of the same HTML element and part of the content that it contains. For example, for the normal state of the hyperlink label <a></a> (no action before),
The status of the visited state, the selected state, the cursor moves to the status on the hyperlink text, and for the first and first lines of the paragraph, you can use the pseudo element selector to define
There are several common ones:
A:active status when a hyperlink is selected
A:hover the cursor moves to the state on the hyperlink
A:link Normal status of hyperlinks
a:visited the status of hyperlinks visited
P:first-line the first line of text in a paragraph
P:first-letter the first letter in a paragraph
. NET Learning notes----2015-07-14 (CSS Write)
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