Using the full-screen control on a <video> embed repositions the containing window into the top left corner

Issue Description:
When using the full screen button on a tag, the video shows in full screen.
When exiting fullscreen, the containing window will stay repositioned in the top left corner, instead in it’s original position

Steps to reproduce:

  1. create a window with a tag
  2. position that window somewhere on the screen
  3. hit the full-screen button
  4. hit the full-screen button again to close down full screen mode

Impact for my app: mid

@Colorfulstan can you please send me the OPK so I will be able to reproduce? thanks