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(for self-backup only) original address: http://blog.csdn.net/chq11106004389/article/details/50515717
CSS composition Selector/selector + declaration (attribute + value)
Selector/selector , which indicates the element in the Web page to which the style rule applies, as in this case p is the selector , its text will turn blue, and the other elements (such as OL) will not be affected
statement: When there are multiple declarations, the middle can be a semicolon ";" Separated
-------------------------------------------------- inline CSS ---from Mu-class ----------------------------- ---------------------------------------------------------------------------------------------------------------
Where can CSS styles be written? From the form of CSS-style code insertion, the basic can be divided into the following 3 kinds: inline , embedded and external three kinds.
Inline CSS stylesheets simply write CSS code directly into existing HTML tags (such as p,span...etc) , such as: <pstyle= "color:red;font-size:12px" > Here the text is red. </p>
<body>
<p> This short word is an example, <span style= "Color:green" > This phrase will turn green </style></span>,<span> but this phrase will not turn green < /SPAN>. Wow Kaka! </p>
</body>
----------------------------------- embedded CSS ---from Mu class -------------------------------------------- ------------------------------------------
The embedded CSS style is the ability to write CSS style code between <style type= "text/css" ></style> tags. The code will uniformly set the text in multiple <span> tags to red:
Embedded CSS styles must be written between <style></style>, and in general the embedded CSS style is written between
------------------------------- external CSS --- From Mu class------------------------------------------------------------------------------------
An external CSS style (also known as an inline) is to write the CSS code in a separate external file, with a CSS style file with a ". css" extension, within
<link href= "base.css" rel= "stylesheet" type= "Text/css"/>
------------------------------------------------- Contrast --- From Mu class--------------------------------------------------------------
These three styles are prioritized, remember their priorities内联式 > 嵌入式 > 外部式
But embedded > external has a premise: the placement of the embedded CSS style must be behind the exterior. As is the case with the right code editor, <link href= "Style.css" ...> code in front of <style type= "Text/css" >...</style> Code (also written in the actual development).
In fact, in summary, that is --就近原则（离被设置元素越近优先级别越高） .
However, note that the precedence summarized above is a precondition: inline, inline, external style sheet CSS style is the same weight in the case, what is the weight of the value? This is explained in the next 9-2 sections.
So the previous CSS style precedence is easy to understand:
Inline style sheet (inside label) > Embedded style sheet (in current file) > external style sheet (in external file)
Reprint: CSS composition, three styles (inline, embedded, external), priority
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