Abstract: A card stack navigation interface provides an aesthetic arrangement of items that are available for selection by a user. When a user selects a stack, such as a column of items in a grid, the items in the selected column may be represented by a more complete and/or larger representation. For example, the items may be shown as images on a grid, but when selected (revealed) by the user via a column, the items in the column may include additional information such as a title, a description, a larger image, and so forth. In addition, a navigation bar may be visually associated with the grid to show a location of content of the grid with respect to all of the content, to enable a user to move to a new location in the content, or for other reasons.

Abstract: Techniques for enhancing content being rendered on an electronic device are described herein. In some instances, the techniques include monitoring interactions between a user and a content item that the user consumes on an electronic device. The content items may include electronic books, songs, videos, documents, or the like. In response to detecting an interaction between the user and the content item, the techniques may publish an event indicative of the interaction to an application platform that hosts one or more applications. The applications may be designed to enhance the content that the user consumes in one or more specified ways.