The best demonstration of parallax elements is on the Stellar.js home page. Other demos are listed below:
While the home page shows off parallax elements, Stellar.js also supports parallax backgrounds.
Mobile Safari halts code execution during scroll so you can't use normal scroll events to animate. By using an iOS scrolling library we're able to bypass this limitation. In order to use Scrollability, Stellar.js is run against the scrolling element and the 'scrollProperty' option is set to 'transform'.
Using Stellar.js on your site?
I'd love to hear about it! Let me know and I might feature your site here.