jQuery uses the existing, ubiquitous API for interacting with the DOM: CSS selectors. Millions of designers already know how to use CSS. Before jQuery, JavaScript developers crawled the DOM with nightmarish, error-prone code while their designer brethren could simply select some page elements and apply styles. jQuery brings the accessibility of CSS targeting to JavaScript.
Glimmer: a jQuery Interactive Design Tool is a prototype from the Mix Online Labs which makes jQuery accessible through a visual tool. The objective for Glimmer is pretty simple: to enable the power of jQuery through an interactive design surface. If jQuery is the "write less, do more” JavaScript library, then Glimmer is the “write none, do more” jQuery design tool. Glimmer has three core audiences: power users, designers and developers.