AccessibleSetValueEvent could probably just be an Event

[esprehn]

The spec has

interface AccessibleSetValueEvent : Event {
    attribute DOMString value;
};

Event has a detail field that can be used for a similar purpose as well, which avoids having yet another event interface. @domenic

[domenic]

Oh dang, it does? @jyasskin, maybe my suggestion of ValueEvent for web Bluetooth was not good.

[jyasskin]

detail is on CustomEvent, not Event.