I am not aware of a comprehensive list like that. You need to keep in mind that Chromecast devices are geared toward consumption of media, so there is a pretty good support for the MediaElements there. In fact it has some additional media extensions such as EME and MSE. In terms of the DOM actions, I suggest to minimize (or better stay away, if possible) of any fancy transitions; the support for most things is there but it is not optimized and the resources required for those to be smooth (i.e. hardware/memory) is scarce on that device.
If you need to find more about the coverage and performance, I suggest you write a simple app that puts any of the many javascript test pages and see the result on the actual device.