RAF is still imprecise for audio use. For audio in the browser, you usually want to defer all timing events that must be precise to a scheduler that uses either the webAudio context time or even more ideally, use a lookahead scheduler to schedule events by audio frame using an internal counter and the sample rate.

A great programming exercise that forces you to wrap your head around JavaScript timing events is writing a small step sequencer that can be used while it is running with minimal latency.