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W3C QA - Recommended list of Doctype declarations you can use in your Web document
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日期：2025-10-06
Recommended Doctype Declarations to use in your Web document. When authoring document is HTML or XHTML, it is important to Add a Doctype declaration. The doctype declaration must be exact (both in spelling and in case) to have the desired effect, which .....看更多
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