Identification and correction of rendering problems that occur when a document (e.g., a web page) is displayed by a document viewer (e.g., web browser) are described. In one exemplary embodiment, a web page has a first element written in a markup language and a second element written in a style sheet language. A method includes receiving a command at a development environment, analyzing a structure of an electronic document responsive to the command, the electronic document having a first element written in a first computer language and a second element written in a second computer language, identifying a relationship between the first and second elements, wherein the relationship causes a rendering problem associated with a document viewer, and presenting information to the user about the rendering problem via the development environment.