1. Concept changes: HTML5 focuses on content and structure, but not on performance Navigation related data> ;
Title: HTML5 Special Video Tutorial
2. Declarations and tags: HTML5 has simplified more declarations and tags, and also made detailed provisions on compatibility, abolished some elements, and added some elements. HTML5 tag syntax introduction and new tags 3. Grammar tags: (1) Tags that are not allowed to write end characters: area, basebr, col, command, Embed, hr, img, input, keygen, link, meta, param, source, Track, wbr (2) The end character tag can be omitted: li, dt, dd, p, rt, optgroup, option, Colgroup, thread, tbody, tr, td, th (3) Tags that can be completely omitted: html, head, body, colgroup, tbody 4. New tags: Markup defines an article
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