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javascript Google Chrome PDF Download in an iFrame not working?

var newWindow ="", "PDF", 'dependent=yes,locationbar=no,scrollbars=no,menubar=no,resizable,screenX=50,screenY=50,width=850,height=800');
'<html><body><center>' +
'<a title="Download File" style="font-family: \'Verdana\';color: #333;text-decoration: none;font-weight: 600;" download="File.PDF" href="data:application/pdf;base64,' + base64 + '">Download File</a>' +
'</center><br>' +
'<object width=100% height=100% type="application/pdf" data="data:application/pdf;base64,' + base64  + '">' +
'<embed type="application/pdf" src="data:application/pdf;base64,' + base64  + '" id="embed_pdf"></embed>' +

My scenario is exactly that! I'm using chrome version 61.0.3163.100. I guess it's some browser flaw, but I did not find anything on google's forums. I am in doubt whether to download the file directly but would not want to give up the chrome PDF viewer.

Temporarily, I have found an ugly and inelegant solution until I have a definitive answer. I created a link in the generated window: