Systems and methods that help ensure that content on a webpage is read and understood by analyzing user activity on a graphical user interface are described. As a user views and interacts with a webpage, activity of the user is monitored. For example, data associated with eye movement, brainwave activity, lip movement, eyebrow movement, and/or forehead wrinkling is collected. This data is then analyzed to determine if the user read and understood the content presented. Should the user fail to read and/or comprehend the content, the user may be alerted and/or prevented from proceeding or accessing additional content.