What s the key difference between HTML 4 and HTML 5

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What are the key differences between HTML4 and HTML5 draft   Please keep the answers related to changed syntax and added removed html elements

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Now W3c provides an official difference on their site   http   www w3 org TR html5-diff

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From Wikipedia    New parsing rules oriented towards flexible parsing and compatibility New elements     section  video  progress  nav  meter  time  aside  canvas New input attributes     dates and times  email  url New attributes     ping  charset  async Global attributes  that can be applied for every element      id  tabindex  repeat Deprecated elements dropped     center  font  strike

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You might be interested in this list of HTML5 elements and attributes   Also  please note that it s  HTML 4   not  HTML4   Indeed  for HTML 5  both variants are used  but there is an important difference in meaning  HTML 5 refers to the name of the W3C specification  whereas  HTML5  is the document type of those HTML files with a text html MIME type that follow this spec  The same goes for XHTML 5 vs  XHTML5

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In short it is much simple compared to html  the long doctype is removed and also center and font tag is removed  I also answered this difference in my blog   http   ravisinghblog in key-difference-between-html-and-html-5

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HTML 5 invites you give add a lot of semantic value to your code  What s more  there are natives solution to embed multimedia content   The rest is important  but it s more technical sugar that will save you from doing the same stuff with a client programming language

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HTML5 has several goals which differentiate it from HTML4   Consistency in Handling Malformed Documents  The primary one is consistent  defined error handling   As you know  HTML purposely supports  tag soup   or the ability to write malformed code and have it corrected into a valid document   The problem is that the rules for doing this aren t written down anywhere   When a new browser vendor wants to enter the market  they just have to test malformed documents in various browsers  especially IE  and reverse-engineer their error handling   If they don t  then many pages won t display correctly  estimates place roughly 90  of pages on the net as being at least somewhat malformed    So  HTML5 is attempting to discover and codify this error handling  so that browser developers can all standardize and greatly reduce the time and money required to display things consistently   As well  long in the future after HTML has died as a document format  historians may still want to read our documents  and having a completely defined parsing algorithm will greatly aid this   Better Web Application Features  The secondary goal of HTML5 is to develop the ability of the browser to be an application platform  via HTML  CSS  and Javascript   Many elements have been added directly to the language that are currently  in HTML4  Flash or JS-based hacks  such as  lt canvas gt    lt video gt   and  lt audio gt    Useful things such as Local Storage  a js-accessible browser-built-in key-value database  for storing information beyond what cookies can hold   new input types such as date for which the browser can expose easy user interface  so that we don t have to use our js-based calendar date-pickers   and browser-supported form validation will make developing web applications much simpler for the developers  and make them much faster for the users  since many things will be supported natively  rather than hacked in via javascript    Improved Element Semantics  There are many other smaller efforts taking place in HTML5  such as better-defined semantic roles for existing elements   lt strong gt  and  lt em gt  now actually mean something different  and even  lt b gt  and  lt i gt  have vague semantics that should work well when parsing legacy documents  and adding new elements with useful semantics -  lt article gt    lt section gt    lt header gt    lt aside gt   and  lt nav gt  should replace the majority of  lt div gt s used on a web page  making your pages a bit more semantic  but more importantly  easier to read   No more painful scanning to see just what that random  lt  div gt  is closing - instead you ll have an obvious  lt  header gt   or  lt  article gt   making the structure of your document much more intuitive

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HTML5 introduces a number of APIs that help in creating Web applications  These can be used together with the new elements introduced for applications    An API for playing of video and audio which can be used with the new video and audio elements  An API that enables offline Web applications  An API that allows a Web application to register itself for certain protocols or media types  An editing API in combination with a new global contenteditable attribute  A drag  amp  drop API in combination with a draggable attribute  An API that exposes the history and allows pages to add to it to prevent breaking the back button

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You ll want to check HTML5 Differences from HTML4  W3C Working Group Note 9 December 2014 for the complete differences  There are many new elements and element attributes  Some elements were removed and others have different semantic value than before   There are also APIs defined  such as the use of canvas  to help build the next generation of web apps and make sure implementations are standardized

[html] What's the key difference between HTML 4 and HTML 5?

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