New Tags in HTML 5

The new tags in HTML 5 are:

<article>
The article element contains the main theme(s) of an HTML document.
<aside>
The aside element is used for an HTML sidebar.
<audio>
<bdi> and <bdo>
The <bdi> tag (bi-directional isolation) isolates a span of text that might be formatted in a different direction from other text outside the bdi element. The <bdo> tag (bi-directional override) explicitly overrides the directionality property of the text within the bdo element.
<canvas>
The canvas element creates a two-dimensional drawing surface which can be used to draw images using 2-D drawing functions.
<command/>
<datalist>
The <datalist> tag is used to create a combo box input field with autocomplete in an HTML form.
<details>
<embed/>
The <embed> tag can be used to embed content from an external resource into a web page.
<figure>
The <figure> tag provides a container for content that is equivalent to a figure or diagram in a book.
<footer>
The <footer> tag is one of the HTML tags for headings and footers in HTML and contains the footer of a section.
<header>
<hgroup>
<keygen/>
<mark>
The <mark> tag can be used to temporarily highlight a fragment of text from another source that was not necessarily highlighted by the original author, such as the search terms that appear in search engine results.
<meter>
The <meter> tag is used for a gauge or other indicator, to display a value on a measurement scale with a specific maximum value.
<nav>
The <nav> tag is used to create a navigation section of a web page.
<output>
<progress>
<ruby>, <rt> and <rp>
The <ruby> tag is used to mark up base text which is to be annotated with supplemental text.
<section>
The <section> tag is used for a generic section in an HTML document.
<source>
The source tag identifies one possible source of the embedded audio or video media indicated by its parent tag.
<summary>
<time>
The <time> tag is used to display a time, Gregorian date, or date and time.
<u>
While the <u> tag was deprecated in 1997 HTML 4 and removed in the year 2000 W3C Recommendation, it has been added back in HTML 5.
<video>
<wbr/>
The <wbr/> tag can be used to specify additional places where the browser can do a line break if necessary.