Methods and apparatus, including computer program products, related to a cross-browser compliant web page zoom feature. A method includes receiving a web page with machine-readable instructions and a zoom factor for the web page; processing a document object model representation of the web page in accordance with the machine-readable instructions; and displaying the web page in a web browser according to the document object model representation. In that method, the processing includes modifying parameters pertaining to content in accordance with the zoom factor, if one or more scalable content parameters exist in the document object model representation, and modifying parameters pertaining to layout in accordance with the zoom factor, if one or more scalable layout parameters exist in the document object model representation.