Nexus 9 tablet here. While in portrait the content takes up what I'd estimate to be 40% of the horizontal space, with the remainder used for ads and whitespace.

Nexus 9 tablet here. While in portrait the content takes up what I'd estimate to be 40% of the horizontal space, with the remainder used for ads and whitespace. The code samples are basically unreadable (requiring horizontal scrolling inside the div). It's not so bad in landscape, however.