Some Useful tags in HTM5 :
<track> HTML Tag : The <track> element is used as a child of an <audio> or <video> element and adds a time-based data source to the parent media element. For example, the <track> element can be used to add timed subtitles to a video and closed captions to audio content.
<time> HTML Tag : Defines a datetime. The content of a time element is typically a human-readable date and time, and a machine-readable version of the same time is placed in the datetime attribute.
<tfoot> HTML Tag : The <tfoot> element identifies one or more <tr> elements as containing summary contents of a table's columns. The <tfoot> element must be the direct descendant of a <table> element. In HTML5, <tfoot> can be placed either before or after <tbody> and <tr> elements, but must appear after any <caption>, <colgroup>, and <thead> elements.
<tbody> HTML Tag The <tbody> element must be a direct descendant of a <table> element and is used to identify <tr> elements that comprise the body of the table. The <tbody> element should always come after a <thead> element and may come before or after a <tfoot> element.
<summary> HTML Tag The <summary> element is used as a child of <details> element to provide a summary of the contents of the <details> element. At this time, <summary> is not well supported across browsers.
<source> HTML Tag The <source> element is used as a child of a <picture>, <audio>, or <video> element, and identifies the URL of one or more media resources. The <source> element is commonly used to add media resources in multiple formats for the best possible cross-browser compatibility.
<section> HTML Tag The <section> element is a structural HTML element used to group together related elements. Each <section> typically includes one or more heading elements and additional elements presenting related content.
<ruby> HTML Tag The <ruby> element is used pair characters of certain Asian languages with pronunciation information. The <ruby> element is used in conjunction with the <rp> and <rt> elements.
<rt> HTML Tag Defines explanations and pronunciations of characters in ruby language annotations (a system for displaying certain characters in several Asian languages).
<rp> HTML Tag Defines content which is to be shown in browsers that do not support ruby language annotations (a system for displaying certain characters in several Asian languages).
<q> HTML Tag The <q> element is used to identify and inline quote that does not require paragraph breaks. Longer quotations that do require paragraph breaks should use the <blockquote> element.