Three concepts of CSS

1. HTML and CSS

Both are developed by the W3C organization. HTML focuses on defining the structure and content of web pages, while CSS focuses on defining the form and appearance of web pages. The purpose of separation is to improve the content and content of web pages. Form stripping.

2. HTML and XHTML

Similar to the relationship between C and C++ languages, see "HTML5 Reconstructing the Internet: Browsers Will Partially Replace Operating Systems".

3. DOCTYPE

Tell the browser what specification to use to parse web content.

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