Web Share: Ability to change background color
The preview link works really well, but it would be helpful if the background colour could be set to a custom colour. The default is white, but it would be handy if you could specify black (or any colour) instead. My reason is that when displaying a mobile screen on various mobile devices for testing, i often get small white stripes at the top and bottom due to variations of screen resolution. If i could set the background colour to black, then the gaps at the top and bottom wouldn't be an issues as the black would blend into a phone's frame.
Michael Woodruff commented
When prototyping for the web and you need to go full screen to get a realistic feel for a web site, it would be better if the background matched the site. I have white wireframes but a background of black. Looks jarring and may effect testing.