The EME spec refers to "fire a simple event" in a couple of places. This was in older versions of HTML, but isn't in the current DOM spec, so EME needs updating.
Having reviewed the DOM spec, we can just replace with "fire an event", as the defaults make this equivalent to "fire a simple event". Will apply this as part of https://github.com/w3c/encrypted-media/issues/519.
The EME spec refers to "fire a simple event" in a couple of places. This was in older versions of HTML, but isn't in the current DOM spec, so EME needs updating.