After almost a year in development, the MooTools team announced the release of version 1.3 with major notable enhancements. Slick Selector Engine
The biggest update is the inclusion of the new Slick standalone selector engine. The engine was developed by Thomas Aylott, Fabio Costa and Valerio Proietti with accuracy and portability in mind, allowing the engine to not only provide MooTools developers with excellent selector support but also the ability for it to be included in other projects (...)

Continuing with my “More than Meets the Eye” series, today I want to talk to you about the MooTools More Form.Validator. There was a comment left on my last post in this series (about Form.Request) specifically requesting that I cover this relatively complex plugin that’s useful for telling users about the validity of data they enter into forms before they send them.
Getting Started with Validators
The main class you need to concern yourself with is the Form.Valdiator class itself which (...)