Cross-Site Scripting (XSS) attacks are one of the most common web security vulnerabilities, allowing attackers to inject malicious scripts into web pages viewed by other users. With over 25 years of experience in software development and as the creator of CoreUI, a widely used open-source UI library, I’ve implemented XSS prevention measures in countless production applications. From my expertise, the most effective approach is to sanitize all user input and use safe DOM manipulation methods that prevent script execution. This method is reliable, widely supported, and should be your first line of defense against XSS attacks.