Ebook doesn't open on Desktop, IE 11 (blank page)

[RobKelley]

Also reported by MTA during their review

I have reproduced locally:

[aslagle]

What versions of IE do we need to support?

[RobKelley]

Per @jdalton

Windows 7

• Internet Explorer 11

Windows 10

• Edge 14

other OS's and browsers now in testing doc: https://docs.google.com/document/d/1vWUnDdfMDd1cjJ274PbOo87PWtsp_m7stbA-CqJXTuE/edit