What does Ajax mean? Is it AJAX or Ajax? Remember those discussions? We had the arguments ... the purists who would shout and scream if you said something was Ajax and didn't use XHR with async mode + XML as the format. Brad Neuberg enjoys thinking about these things and has put together some thoughts in two posts: Why I'm Going to Keep Calling it HTML5 and HTML5 Defined! It's Not Just a Marketing Term. Brad takes apart the various specs and APIs: * "HTML5 Strict" - Things that are strictly inside the W3C's HTML5 spec. * "Referenced by HTML5" - Things that are referenced by the HTML5 spec and which can optionally be parsed into the DOM and displayed. * "Broken out of HTML5" - Things that used to be part of HTML5 or its older iterations, called Web Applications and Web Forms. * "HTML5 Family of Technologies" - Extended set of technologies not strictly part of HTML5 spec or referenced but likely to be used in conjunction with HTML5. * "HTML5++" - More experimental technologies pushing the web forward that are not part of the HTML5 spec at all; may or may not see broader adoption. You can take a look of Brad talks here: http://codinginparadise.org/weblog/2008/07/open-web-definition-version-04.html