HTML5 is the standard markup language for web development. Earlier version HTML 4 doesn’t have the specifications like this.
HTML5 got its biggest advantage of session, cookies, Geological mapping, Compatible forms and improved tag elements. It can store cookies in its local database. If you know how to code in HTML5 then you got a better web development opportunity. Simply we can say that HTML5 is the future of web development. Here is the HTML5 cheatsheet which will help web developers more.
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HTML5 for web developers.
Overview of HTML5 with new and old specifications.
HTML5 browser support.