Abstract: Systems and methods are described for dynamically presenting overlay content on portions of an image or video within a page or other user interface, while allowing at least partial user interactivity with the underlying image or video. Overlay content may be displayed within a container object that is placed over the underlying page image or video. The visible overlay content may be smaller than and/or differently shaped than the container object (such as by not being rectangular and/or by the overlay content including transparent portions), such that some of the underlying image or video remains visible beneath the overlay content and the container. When a user selection is made within the container object, the responsive action to be performed by the client computing device may be either an action identified in the original page code or an action associated with the overlay content, depending on location of the selection.