Abstract: In one embodiment, one or more server computing devices receive from a client computing device associate with a user a request for a structured document including an image; the server computing devices access a data store for data associated with the image; the server computing devices construct based at least in part on at least some of the data associated with the image a text string corresponding to the image in the structured document; the text string is configured to be audibly read out by the client computing device; the server computing devices also send the structured document with the text string to the client computing device for presentation to the user.

Abstract: Methods, systems and media for dynamically configuring a presentation layer associated with a webpage delivered to a client device are provided. A request for a webpage is received and a number of static components of the webpage and a script are sent, the script being capable of determining a number of characteristics of the client device. A number of characteristics of the client device are received. One or more presentation-layer components of the webpage are determined based on the characteristics received. The presentation-layer component(s) of the webpage are sent to the client device.