Now, everyone that uses Behaviour/EventSelector with Prototype/Scriptaculous can’t say, “YUI sucks because you end up writing too much code for each DOM element”.

Kudos to Caridy.

By the way, event-driven application development like this using css selectors isn’t faster. It always has to keep crawling the DOM–but what if you update the DOM dynamically/periodically? You’ll need to keep crawling the DOM again and re-attach the listeners. Yes, you write less lines of code–but you end up crawling the DOM too much–which gets CPU intensive (IE6 cries like a baby when crawling, Safari, Firefox, Opera and IE7 can crawl nicely).