The Chrome mobile browser has introduced a new web page switching model where users select a button to enter a web page switching interface. Users can drag web pages up and down, and web pages are spread out like a stack of cards (see Figure 1b). We will refer to this as the “Cards” interface. Our goal is to compare the two switching interfaces, in the context of web page switching, in order to understand their effect on user performance in terms of time on task and error rates.