[christoph]

Worth mentioning that After Effects can export CSS/SVG/canvas animations with the free bodymovin/Lottie plugin. This is my personal go to for creating web key frame animations and elements.

Not every after effects feature is exportable, but it’s the best and most reliable solution I’ve found for this type of workflow, maybe due in part though to my previous experience with AE.

Currently supported features: http://airbnb.io/lottie/#/supported-features