An overlay may be displayed over a webpage for displaying different analytics, such as displayed with heatmaps. The webpage is parsed to identify webpage objects. Proxy objects are generated for the identified webpage objects and displayed on Z-index layers above the overlay. The proxy objects are configured to detect and react to events on behalf of associated webpage objects. A mobile device proxy server may send mobile device requests on behalf of a desktop computing device and modify received webpages so the desktop computing device renders the webpages in substantially a same manner as a mobile device.