Prototype JavaScript framework: Prototype 1.7 RC1: Sizzle, layout/dimensions API, event delegation, and more

We've just tagged the first release candidate of Prototype 1.7: a major new version with some major new features. Sizzle as the selector engine (or mix in your own) With Prototype 1.7, we've finally realized our long-held goal of moving to Sizzle, the middleware selector engine used by jQuery and others. I wrote our previous selector engine, used since 1.5.1, but nevertheless I'm excited to switch