Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for providing user interface development tools. In one aspect, a method includes receiving, from a client device, network request data that specifies, for each of multiple network requests that were transmitted from the client device to a server during a user session, a requested user interface element and a load time that indicates a duration of time between a time at which the network request was initiated and a time at which the user interface element was loaded in a user interface at the client device. An interactive interface is generated. The interactive interface includes a session replay area that presents playback of visual changes of the one or more user interfaces that occurred during the user session and a network request area that presents a list of network requests that were transmitted during the user session.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for providing user interface development tools. In one aspect, a method includes receiving console logs that specify sequences of user interface events that occurred during user sessions. For each of multiple user sessions, a received console log for the user interface events that occurred during that user session is identified. Playback data that presents visual changes of one or more user interfaces of the publisher that occurred during that user session is generated. An interactive interface is generated and provided. The interface includes session replay area in which the playback data presents the visual changes of the one or more user interfaces of the publisher that occurred during that user session and a console log area that presents console entries from the console log for the user interface events that occurred during that user session.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for evaluating interactions with a user interface are disclosed. In one aspect, a method includes identifying a set of mutation events specifying changes to the structure of a user interface that occurred during the user session, and generating user interface states specifying different structures of the user interface throughout the given user session. Based at least in part on the user interface states, playback data that present visual changes of the user interface corresponding to the set of mutation events that occurred during the user session are generated. Session activity data describing user interactions that occurred during the user session are also generated. At least a portion of the playback data and the session activity data are output to a requesting device.