1. On a computing device comprising a see-through display and an outward-facing camera configured to acquire image data of a real-world background for display on the see-through display, a method of displaying an image, the method comprising: receiving via a network from a remote computing device rendered image data representing a non-text portion of the image; receiving via the network from the remote computing device unrendered text data representing a text portion of the image, the unrendered text data comprising text in a display-neutral markup format comprising markup specifying whether the text is to be displayed at a fixed location relative to a see-through display screen or a fixed position relative to a real-world background image; at the computing device, locally rendering the unrendered text data based upon local contextual rendering information to form locally rendered text data, the local contextual rendering information comprising information regarding a time-dependent context of the real-world background; compositing the locally rendered text data and the rendered image data to form a composited image; and providing the composited image to the see-through display.