It implements DestinationName in pdfMake.createPdf(docDefinition).open(DestinationName);
its open the pdf document in a iframe or a frame, if there no param, then in _blank
done

done this =D
"how about letting the user open up a new tab with specified name (instead of default _blank)? this would let him/her open previews in a specific tab

on the other hand, if no frame is detected - no alert will appear and instead a new tab will come up

what do you think?"
Merge pull request #117 from tocado/master

DestinationName in open() prototype