Spotify Embed doesn't play full tracks on narrow browsers

[davidvgalbraith]

Device

Macbook Pro, Early 2011

Operating System

Mac OSX

My site has a Spotify Embed widget. In Google Chrome, with a full-size browser window, it plays full tracks. However, if I decrease the browser window width to 375px, it only plays 30-second previews, and it says "To play the full track you'll need the Spotify app." Why can't I play full tracks in narrow browser windows?