[_greim_]

Web browsers should add a DOM method called `addEventStream()` to supplement `addEventListener()`. It would still accept an event type—e.g. `button.addEventStream('click')`—but would not accept a handler function. It would just return an async iterator of event objects. Backpressure on the iterator would place the element into a `:waiting` state similar to `:disabled` in which the element would become non-interactive. All UI event handling becomes a data processing pipeline.