Real World Accessibility: HTML5, ARIA and the Modern Web
What do I even mean by real world? It’s very simple: Accessibility doesn’t and shouldn’t exist in a vacuum. The real world is messy. It isn’t black and white but every shade of grey in between. This applies to accessibility but also to our craft in general. We have to make compromises. We have to make choices. We have to change tactics mid-stream. And we have to have it finished yesterday.
Nice, detailed post on HTML5 and ARIA support by Derek Featherstone.