Abstract: In one embodiment, a method includes constructing a plurality of versions of a first content item respectively for a plurality of device platforms, the first content item comprising one or more second content items. For each version of the first content item corresponding to a specific device platform, selecting at least one of the second content items to be included in the version of the first content item based on a screen configuration of the specific device platform; and arranging the at least one of the second content items for presentation on a screen of the specific device platform according to the screen configuration of the specific device platform.

Abstract: In one embodiment, a method includes, by a computing device, providing a user interface for presentation. The user interface includes multiple components arranged in a hierarchy. The hierarchy includes one or more layers, each layer including at least one component. The computing device receives user input associated with user interaction with a first component of a first layer, prompting a resizing of the first layer. The computing device resizes the first layer at least in part by automatically modifying content of one or more elements of the first component.