I was bidding on a project today and requested to use GSAP as my Javascript animation engine (they had originally said CSS transitions).
The one question they had was 'how far back' GSAP goes — that is, will it work in IE9, IE8, and other older browsers?
I had never thought of this and didn't know the answer.
Also they wanted to know if GSAP 'degraded gracefully'. If GSAP doesn't work on all older browsers, how do I handle that? I know Modernizr can be used (or could be used) to provide fallbacks, but I don't know that it has a test for Greensock. What would I test for? Are there polyfills?
Thanks for any info!