I am presenting this information — not because you can’t do the Google search yourself — but as a reminder of the Google search which I did.
“Flash died in 2007, and everyone’s been catching up since then. It’d long since been the worst part of the web” 
Todays Big Players
That open technologies would prevail on the web is mainly thanks to the support for open standards by Google (Android), Apple (iOS) and others. It is also do to the ascendancy of the mobile market place: if it doesn’t run on a mobile device, it is not mainstream (anymore).
Industry Best Practices
The AWWWARDS for Animated Websites showcases some of the best work available on the web today. I will particularly recommend the WanderWorld example. Scrolling down drives the animation. Another thing that comes out here is the pre-eminence of ‘flat’ animation these days.
In looking for a tool to help me produce web animations for the game that I am working on, I have been looking for actual animations which run on my Android phone. Sadly, I have found many more screenshots of development tool environments than actual finished products deployed on the web. This is especially true for Apple’s Hype 2
So what has caught my eye, and now has my attention, is Mixeek “Free css3 and html5 [online] animation tool”.
 “(external) http://mac.appstorm.net/reviews/web-dev-review/hype-2-the-simplest-way-to-make-web-animation/“http://mac.appstorm.net/reviews/web-dev-review/hype-2-the-simplest-way-to-make-web-animation/