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    Usually, w3schools is not a reliable source. You'd better use the Mozilla Developer Network instead. Commented Feb 23, 2012 at 10:34
  • WebWorker have access to the BOM. But for keeping them non-concurrent with the main script, which has access to the DOM, you canno't access the DOM. But why should someone even want to do this? Commented Jul 30, 2014 at 9:19