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<!-- (APIs) application programming interfaces 
HTML5 specification, one published by the W3C and another by the WHATWG. The living HTML specification maintained by the WHATWG contains additional APIs to those in the W3C HTML5 spec -->

Some APIs

Media API
Text Track API
Drag and Drop
Offline Web Applications/Application Cache
User Interaction
History
MIME type and protocol handler registration
APIs in the WHATWG specification
The "HTML5" buzzword APIs
Demos and browser Support