Briefly describe what is css?

CSS is the abbreviation of English Cascading Style Sheets (cascading style sheets). It is a computer language used to express document styles such as HTML or XML.

There are three types of style sheets:

1. Externally linked style sheets. Refers to using CSS files to link to HTML files.

2. Internal style sheet. It refers to the style sheet in the header (in the head) of the HTML page, in the form:

<style type="text/css">
声明{ 属性: 值;}
</style>

3. Embedded style sheet. It refers to the style embedded in the HTML tag, in the form of style="attribute: value;"

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