Abstract: One or more techniques and/or systems are provided for constructing a content interface layout. For example a search query may be received from a user of a device. A content interest context for the user may be identified (e.g., a time of day, a season, a user location, a user social network post about planting a garden, device type of the user, etc.). Content interfaces (e.g., a gardening image collection, a tomato planting instructional app, a soil related topic search suggestion, etc.) may be populated within content interface slots of a search results canvas for the search query based upon user engagement metrics and the content interest context. In this way, content interfaces, comprising supplemental content, may be assigned to content interface slots so that such content interfaces have a high probability of being relevant to and/or engaged by the user.