Systems and methods are configured to receive an indication that a moment, such as an anchor, is to be positioned at a first location on a webpage, via code embedded in the webpage. A content specification associated with the anchor is received. An interaction rule associated with the anchor is received that specifies that content specified by the content specification is to be displayed at least partly in response to a specified user interaction with the webpage. Code is automatically generated configured to cause the anchor to be located at the first location when accessed by a user browser, wherein, at least partly in response to a user browser accessing the first webpage, and the first user interacting with the webpage in a manner that satisfies the interaction rule, the content specified by the content specification is rendered.