Dynamic Media Unit Switching Between Different Media Types Based On Loading State And User Interaction

A data processing system can generate multimedia units for display with information resources on client devices that allow dynamic adjustment of media content, for example, based on client device capabilities, user\u27s browsing behavior and actions, loading state of the media content, or a combination thereof. Each multimedia unit can include a thumbnail image, a first link to a first video sequence, a second link to a second video sequence, and a software module (e.g., controller) for controlling display of the image thumbnail and content associated with the first and second video sequences