A composite document system is implemented as instructions stored on a computer-readable medium. When executed on a processor, the instructions cause the processor to receive model data that describes a three-dimensional model of an object, where the three-dimensional model is generated using a modeling software, and where the model data conforms to a non-image format of the modeling software. The instructions further cause the processor to receive web page data that includes content and description of the content in a mark-up language, generate a composite document that includes the model data and the web page data, interpret the model data in the composite document to generate a visual representation of the three-dimensional model, and interpret the web page data in the composite document to generate a visual representation of the web page data.