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The global structure of an HTML document - World Wide Web Consortium (W3C)
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日期：2025-06-21
The URI in each document type declaration allows user agents to download the DTD and any entity sets that are needed. The following (relative) URIs refer to DTDs and entity sets for HTML 4: "strict.dtd" -- default strict DTD "loose.dtd" -- loose DTD "fram...看更多
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