Welcome to WebmasterWorld Guest from 126.96.36.199
Forum Moderators: open
With Theater View, the viewing window widens and adds theater curtains on the sides while darkening the rest of the page. In Lights Out, just the rest of the page is darkened.
The Lifehacker page has a link as an example of the new modes. The article goes on to state that not all videos have had the new modes implemented.