Data channel receive procedure missing?

[lgrahl]

It seems there is no data channel receive procedure that can be followed, e.g. nothing tells us when a message event is invoked and what validation steps are required (check for open [or closing], ...).

The WPT tests reference this WS spec section (When a WebSocket message has been received [...]) and I would propose to copy that.

[lgrahl]

We should discuss whether messages can still be received by the peer who initiates the closing procedure or not (see this discussion beginning at comment 55).

[aboba]

@lgrahl Agree that the closing procedure doesn't provide enough detail. As discussed in Issue 559394, when a peer calls close() (resulting in readyState transitioning to "closing") more messages can't be sent, but data can still be received until readyState becomes "closed".