Well as you can say the same for popup windows which should work for keyboard navigation and voice commands as well, I assume there is a defined class of events

Well as you can say the same for popup windows which should work for keyboard navigation and voice commands as well, I assume there is a defined class of events that count as active user interaction and I assume that onload, mousemove and onresize do not fall in that category but click, keypress do. Anyway if you focus a button and press it by hitting the spacebar or enter key a javascript click event is triggered as well. So even if you would limit it to click events I guess it would for a large portion of keyboard navigation as well.