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http://www.whatwg.org/demos/workers/multiviewer/page.html I get an exception opening it in Safari, and the example is dysfunctional. worker.js:47 TypeError: 'undefined' is not an object (evaluating 'event.port._data') Should it be event.ports[0]._data?
(turns out that wasn't the only problem... it's hard to write code when you can't run it!)