Patent attributes
Methods, systems, and apparatus, including computer program products for defining landing pages to test different landing page designs. User input specifies a landing page having sections, each section having an original version of content. User input also specifies one or more additional versions of content, the original and the additional versions together constituting alternative versions, and the landing page with the alternative versions together constituting an experiment. Page fragments are determined. The fragments are added to the landing page and are operable, when interpreted by a client-side browser, to choose one of the alternative versions of each identified section and make each chosen alternative version the content of the corresponding section before the landing page is displayed by the browser. A designer can insert the page fragments into the landing page to produce an instrumented landing page.