HTML

NEW TAGS IN HTML5:
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<article>New Defines an article
<aside>New Defines content aside from the page content
<audio>New Defines sound content
<bdi>New Isolates a part of text that might be formatted in a different direction from other text outside it
<canvas>New Used to draw graphics, on the fly, via scripting (usually JavaScript)
<command>New Defines a command button that a user can invoke
<datalist>New Specifies a list of pre-defined options for input controls
<details>New Defines additional details that the user can view or hide
<embed>New Defines a container for an external application or interactive content (a plug-in)
<figcaption>New Defines a caption for a <figure> element
<figure>New Specifies self-contained content
<footer>New Defines a footer for a document or section
<header>New Defines a header for a document or section
<hgroup>New Groups heading (<h1> to <h6>) elements
<keygen>New Defines a key-pair generator field (for forms)
<mark>New Defines marked/highlighted text
<meter>New Defines a scalar measurement within a known range (a gauge)
<nav>New Defines navigation links
<output>New Defines the result of a calculation
<progress>New Represents the progress of a task
<rp>New Defines what to show in browsers that do not support ruby annotations
<rt>New Defines an explanation/pronunciation of characters (for East Asian typography)
<ruby>New Defines a ruby annotation (for East Asian typography)
<section>New Defines a section in a document
<source>New Defines multiple media resources for media elements (<video> and <audio>)
<summary>New Defines a visible heading for a <details> element
<time>New Defines a date/time
<track>New Defines text tracks for media elements (<video> and <audio>)
<video>New Defines a video or movie
<wbr>New Defines a possible line-break


Global Attributes:
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contenteditableNew Specifies whether the content of an element is editable or not
contextmenuNew Specifies a context menu for an element. The context menu appears when a user right-clicks on the element
draggableNew Specifies whether an element is draggable or not
dropzoneNew Specifies whether the dragged data is copied, moved, or linked, when dropped
hiddenNew Specifies that an element is not yet, or is no longer, relevant
spellcheckNew Specifies whether the element is to have its spelling and grammar checked or not




Not in HTML5:
======================
<acronym>
<applet>
<basefont>
<big>
<center>
<dir> Not supported in HTML5
<font> Not supported in HTML5
<frame> Not supported in HTML5
<noframes> Not supported in HTML5
<frameset> Not supported in HTML5
<strike>
<tt>