Quartz Composer Programming Guide: Webpages and Widgets This is pretty cool... I don't think many Mac users know that you can run most Quartz compositions in your browser nowadays, if you're using a late-model version of Safari or WebKit on Mac OS X 10.4.7 or later. Now Apple is trying to educate us on how we can make those compositions interactive using JavaScript. This document explains how to embed a composition in HTML and how to manipulate it using JavaScript.