Three common ways to embed CSS in HTML documents-HTML Tutorial-php.cn

Three common ways to embed CSS in HTML documents

高洛峰

Release： 2017-02-23 13:33:56

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The following three ways are commonly used to define CSS in HTML: Embedding (embedded), Linking (reference), Inline (inline)

1. Embedded

Use HTML The style element defines CSS styles in the document.

<head> 
<style type="text/css"> 
h1{color:red} 
p{color:blue} 
</style> 
<head>

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2. Inline

Each HTML element contains a style attribute, which can directly define the style. This style can only be applied to the content of this element and has no effect on another element with the same name.

<p style="color:#FFF;font-weight:bold;">内联样式</p>

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3. External reference type

External reference means that the HTML document itself does not contain CSS styles, but dynamically references external CSS files to define the presentation form of the document.

1. Use the processing instruction statement of the style sheet

Write an instruction processing statement about the style sheet at the beginning of the HTML document

<?xml-stylesheet type="text/css" href="mystyle.css" ?> 
<html> 
指令语句 
</html>

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But it can only be written in the xml syntax format This directive is only supported for html documents. Most browsers are only valid when saved as xhtml or xml format, and JS cannot handle this kind of CSS, so it is not recommended to use it.

2. Use the @import command

Use the @import command between style elements to import external css files

<head> 
<style type="text/css"> 
<!--下面两行代码效果一样 
@import "mystyle.css"; 
@import url("mystyle.css"); 
--> 
</style> 
</head>

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Any @import rule must appear before all rules. The parameter is the URL address of a css file. You can also use the @import directive in a css file to import another css file.

3. Use the link element

<head> 
<link rel="stylesheet" href="css的url" type="text/css" > 
</head>

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This is also the most commonly used method.

4. Use the HTTP message header to link to the style sheet

You can use the link field of the HTTP message header to link to an external style sheet.

link:<mystyle.css>;rel=stylesheet; 
//等同于<link rel="stylesheet" href="css的url" type="text/css" >

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Multiple links can be used in the HTTP header to link multiple style sheets, and the link in the HTTP header has priority over the link in the HTML document (in the head element).

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