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From the spec, it says "stop must only be called one time and only after a call to start or stop, or an exception will be thrown." It's confused to me that if stop can be called only one time, it should be impossible that stop can be called after stop. In offlinemode, stop can be called multiple times from web developers' eyes. So maybe it will be more reasonable if we describe it like this: start can be called only when playbackState is UNSCHEDULED_STATE, or InvalidStateError exception will be thrown. stop can be called only when playbackState is SCHEDULED_STATE or PLAYING_STATE, if not, InvalidStateError exception will be thrown.
Web Audio API issues have been migrated to Github. See https://github.com/WebAudio/web-audio-api/issues
Closing. See https://github.com/WebAudio/web-audio-api/issues for up to date list of issues for the Web Audio API.