nl_tokens: checkFileReaderSyncSupport : Create a temporary worker and see if FileReaderSync exists
pl_tokens: function checkFileReaderSyncSupport ( ) { var <mask> = makeWorker ( syncDetectionScript ) ; if ( worker ) { worker . onmessage = function ( e ) { FileReaderSyncSupport = e . data ; } ; worker . postMessage ( { } ) ; } }