Difference between HTML 5 and HTML 4

[roshell]

HTML has been in continuous evolution since it was introduced to the Internet in the early 1990's. Some features were introduced in specifications; others were introduced in software releases. In some respects, implementations and author practices have converged with each other and with specifications and standards, but in other ways, they continue to diverge.

HTML4 became a W3C Recommendation in 1997. While it continues to serve as a rough guide to many of the core features of HTML, it does not provide enough information to build implementations that interoperate with each other and, more importantly, with a critical mass of deployed content. The same goes for XHTML1, which defines an XML serialization for HTML4, and DOM Level 2 HTML, which defines JavaScript APIs for both HTML and XHTML.

[alexissamantha]

Thanks for sharign with us its very interesting and very informative too,,,,

[srache]

The info can be found at http://www.w3.org/TR/html5-diff/

[Erastos Adelbert]

HTML 5 is defined in a way that it is backwards compatible with the way user agents handle deployed content. To keep the authoring language relatively simple for authors several elements and attributes are not included as outlined in the other sections of this document, such as presentational elements that are better deal with using CSS.

[semal]

some browsers still have issues with html 5 especially IE, a smart developer would holf off for a while!

[SidneySilas]

The XHTML 2 spec is way better than the HTML 5 spec. XHTML 2 is SGML. XHTML 2 is XML. HTML 5 is neither.

[lasikeye]

The same goes for XHTML1, which defines an XML serialization for HTML4, and DOM Level 2 HTML, which defines JavaScript APIs for both HTML and XHTML.