Auto View Port changing web page

When using the default setting for enableAutoViewport, or setting it to true, a white box is added to the web page. If I set enable AutoViewport to false, then no white box, but then I lose the functionality of allowing the window to be used in the whole page, because I have to define my own viewport.

Could you please attach a demo?

Turned out, it was because the img path was not being set.  I was not worrying about it at the time.  I was concentrating on the white box being added to the main page and couldn’t figure it out.  When I decided to just get the window icon working, by adding the image path, the white box went away.  Maybe the div being added to the document.body for the window is using a transparent image instead of just setting background-color: transparent?