In some examples, a content variation service may identify elements of content and generate variations of the elements of the content programmatically. Content may include a website and the elements of the content may include visual and structural elements that make up the website. The variations of the elements may be provided with the content to a user as part of an engagement test. The engagement test may test how the user interacts with the variations of the elements. Based on results of the engagement test, the elements of the content may be adjusted and other variations may be generated.