Explore a comprehensive conference talk on implementing Content Security Policy (CSP) to prevent cross-site scripting (XSS) vulnerabilities. Learn about the evolution of CSP, focusing on version 3's strict-dynamic mechanism, which simplifies application to existing web pages without major refactoring. Discover how Pinterest and Instapaper successfully deployed strict CSP, including implementation tips and potential pitfalls. Gain insights into topics such as nonces, hashes, whitelisting, and JavaScript templates. Understand the deployment process, necessary code changes, and the benefits of report-only mode. Equip yourself with practical knowledge to enhance web application security and effectively combat XSS attacks.