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In HyBi list, some people wondered if close() may interrupt ongoing "Send a WebSocket Message" for a large message or not. Especially, about the API spec, people wondered if the data "queued" has any implication that they stay unsent to network and closing handshake may jump in. http://www.ietf.org/mail-archive/web/hybi/current/msg10480.html It's good if there's some note saying that when close() is called, closing handshake actually happens after flushing all data for preceding send() calls.
Hopefully this clarifies it enough, reopen otherwise!
Checked in as WHATWG revision r8516. Check-in comment: Clarify that close() doesn't drop earlier sent() images. http://html5.org/tools/web-apps-tracker?from=8515&to=8516