Button Actions

Cool spec for an action attribute on buttons, but I particularly liked this description of the distinction between a button and a link:

Buttons model actions which affect the current document, while hyperlinks model other documents (which the user could choose to open in the current browsing context, or a new one). Even though they both might result in GET requests, they represent different possibilities on the page...A button enforces that the close action always happens in this browsing context, while a hyperlink does not.