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When the spec says to: queue a task to do X and do Y it's unclear whether to parse that as queue a task to (do X and do Y) or (queue a task to do X) and (do Y) (E.g., 4.8.10.6 "Offsets into the media resource" has: the user agent may queue a task to remove the track ... and then fire a trusted event ... Is the event fired inside the task or outside?) I think the former interpretation is usually intended, but I'm also pretty sure that the latter is sometimes intended (e.g., when "do Y" = "abort these steps" or when it queues another task). To clarify, you could use a well-placed "first": queue a task to first do X. and then do Y vs first queue a task to do X, and then do Y
I can fix specific cases if you list them, but I'm not sure how to efficiently find these.
Checked in as WHATWG revision r7943. Check-in comment: Clarify a bit http://html5.org/tools/web-apps-tracker?from=7942&to=7943
Please reopen or file new bugs if you find specific ambiguous cases. (It's fine to file lots of bugs.)