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HTML5 is the fifth major standard of HTML. Development of the standard began in 2007 and HTML5 websites started becoming mainstream in 2010. The final HTML5 standard was officially standardized by W3C on October 28, 2014.
The previous HTML standard, HTML 4.01, was standardized in 1999 – fifteen years before the HTML5 standard was published. However, in the decade preceding HTML5, most websites were written in XHTML, a more strict version of HTML published in 2000. HTML5 was designed to supersede both HTML 4 and XHTML by providing web developers with a simpler standard that includes several new features for the modern web.
The table below includes a list of new elements, or tags, introduced in HTML5 that are used to define the structure of a document.
These tags simplify the webpages source as well as the corresponding CSS styles. For example, in order to define a navigation element in XHTML, you would typically write <div class=nav> in the pages HTML and define a class called .nav in CSS. In HTML5, you can simply insert the <nav> tag in the HTML and style the element itself using CSS.
NOTE: Previous HTML standards included a space between the HTML and the number (i.e., HTML 1.0, HTML 4.01). HTML 5.0 does away with the space and is officially written as HTML5.