YouTube is trying out a new way to display comments even when you're watching in landscape on your Android phone. Usually, comments disappear when you watch clips in landscape, except when you're tuning in to a live stream. Now, YouTube is testing out a floating comment box that some Android users have spotted. What it does to the video is shrink it down a bit to accommodate the comment box on the left. It does seem like an intelligent way to be able to see comments while watching videos.
Source: 9to5Google