HTML5 is the next generation of HTML and become the new standard for HTML, XHTML, and the HTML DOM. HTML5 adds many new features. HTML5 adds new elements and APIs. To gather wide acceptance, HTML5 needs to remain backwards compatible with previous versions. Because of this, the HTML5 tags labeled as "deprecated" or "unsupported" are still supported by browsers, but their use is highly discouraged.

Tag Description
<!--...--> Defines a comment
<!DOCTYPE>  Defines the document type
<a>Changed Defines a hyperlink
<abbr> Defines an abbreviation
<address> Defines an address element
<area> Defines an area inside an image map
<article> Defines an article
<aside> Defines content aside from the page content
<audio> Defines sound content
<b>Changed Defines bold text
<base> Defines a base URL for all the links in a page
<bdi> Defines a span of text that is isolated from its surroundings for the purposes of bidirectional text formatting
<bdo> Defines the direction of text display
<blockquote> Defines a long quotation
<body> Defines the body element
<br> Inserts a single line break
<button> Defines a push button
<canvas> Defines graphics
<caption> Defines a table caption
<cite> Defines a citation
<code> Defines computer code text
<col> Defines attributes for table columns 
<colgroup> Defines groups of table columns
<command> Defines a command button
<datalist> Defines a dropdown list
<dd> Defines a definition description
<del> Defines deleted text
<details> Defines details of an element
<dfn> Defines a definition term
<div> Defines a section in a document
<dl> Defines a definition list
<dt> Defines a definition term
<em> Defines emphasized text 
<embed> Defines external interactive content or plugin
<fieldset> Defines a fieldset
<figcaption> Defines the caption of a figure element
<figure> Defines a group of media content, and their caption
<footer> Defines a footer for a section or page
<form> Defines a form 
<h1> to <h6> Defines header 1 to header 6
<head> Defines information about the document
<header> Defines a header for a section or page
<hgroup> Defines information about a section in a document
<hr>Changed Defines a horizontal rule
<html>Changed Defines an html document
<i> Defines italic text
<iframe> Defines an inline sub window (frame)
<img> Defines an image
<input>Changed Defines an input field
<ins> Defines inserted text
<keygen> Defines a generated key in a form
<kbd> Defines keyboard text
<label> Defines a label for a form control
<legend> Defines a title in a fieldset
<li> Defines a list item
<link> Defines a resource reference
<map> Defines an image map 
<mark> Defines marked text
<menu>Changed Defines a menu list
<meta>Changed Defines meta information
<meter> Defines measurement within a predefined range
<nav> Defines navigation links
<noscript> Defines a noscript section
<object> Defines an embedded object
<ol> Defines an ordered list
<optgroup> Defines an option group
<option> Defines an option in a drop-down list
<output> Defines some types of output
<p> Defines a paragraph
<param> Defines a parameter for an object
<pre> Defines preformatted text
<progress> Defines progress of a task of any kind
<q> Defines a short quotation
<rp> Used in ruby annotations to define what to show browsers that to not support the ruby element.
<rt> Defines explanation to ruby annotations.
<ruby> Defines ruby annotations.
<s>Changed Represents content that is no longer accurate or no longer relevant
<samp> Defines sample computer code
<script> Defines a script
<section> Defines a section
<select> Defines a selectable list
<small>Changed Defines small text
<source> Defines media resources
<span> Defines a section in a document
<strong> Defines strong text
<style> Defines a style definition
<sub> Defines subscripted text
<summary> Defines the header of a "detail" element
<sup> Defines superscripted text
<table> Defines a table
<tbody> Defines a table body
<td> Defines a table cell
<textarea> Defines a text area
<tfoot> Defines a table footer
<th> Defines a table header
<thead> Defines a table header
<time> Defines a date/time
<title> Defines the document title
<tr> Defines a table row
<track> Enables supplementary media tracks such as subtitle tracks and caption tracks to be specified for audio and video elements.
<u>Changed Defines a span of text offset from its surrounding content without conveying any extra emphasis or importance
<ul> Defines an unordered list
<var> Defines a variable
<video> Defines a video
<wbr> Defines a possible line-break

HTML5 Integrated APIs

HTML5 has incorporated several new APIs, including:

  • Video and Audio API
  • Inline Editing API
  • Offline Application API
  • History API
  • Web Protocol API
  • Drag & Drop API

HTML5 Associated APIs

HTML5 has several new associated APIs, including:

  • Geolocation API
  • 2D Canvas Drawing API
  • Local Storage API
  • Web Workers API
  • Web Sockets API
  • Messaging API

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