Steps to reproduce
download attribute doesn’t appear to be used when “downloading” a hyperlink containing a blob href.
Test Case: https://jsfiddle.net/08dzeq3e/6/
IE => Doesn’t download at all
Edge => Downloads with filename"E0F5CA16-F4AA-4B18-9A07-BFDD1F0633BD"
Chrome => Downloads with filename “my-download.json”
Firefox => Downloads with filename “my-download.json”
Filename is also not set correctly when using a markup syntax like: http://www.w3schools.com/tags/tryit.asp?filename=tryhtml5_a_download2