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Changes from HTML4
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Syntax
- HTML5 specifies its own syntax rules authors have to follow. These syntax rules are compatible with the XHTML syntax rules althoug this does not imply that parsing such a document with an HTML parser will give the same result as parsing it with an XML parser.
- HTML5 defines its own parsing rules (including "error correction") for text/html resources and no longer assumes SGML features are supported.
New elements
- article
- aside
- audio
- canvas
- command
- datagrid
- datalist (Web Forms 2)
- details
- dialog
- embed
- event-source
- figure
- footer
- header
- m
- (new semantics and no longer deprecated)
- meter
- nav
- output (Web Forms 2)
- progress
- section
- source
- time
- video
Changed elements
These elements have a new meaning in HTML5 which is incompatible with HTML4. The new meaning better reflects the way they are used on the web or gives them a purpose so people can start using them.
- b
- hr
- i
- menu
- small
- strong
Dropped elements
- acronym (use abbr instead)
- applet (use object instead)
- basefont
- big
- center
- dir
- frame
- frameset
- isindex
- noframes
- noscript (only dropped in XHTML5)
- s
- strike
- tt
- u