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Improve hooks with Page Visibility. #77
The Page Visibility specification doesn't provide a clear way to hook into "document becomes visible/hidden". For the moment, the specification is using "now visible algorithm" but it could be improved.
I sent an email about that: http://lists.w3.org/Archives/Public/public-web-perf/2014Sep/0034.html
This is marked as a Future Enhancement because this specification can only hooks into Page Visibility if Page Visibility does the work for that to happen.