Controlling Browser Features with Permissions and Feature Policy

Every modern web application interacts with powerful browser features, from geolocation to camera access, but unmanaged access poses a significant security risk. Securing these capabilities requires a clear understanding of how to control browser permissions at the HTTP header level. This text-based course guides you from the absolute basics of web security headers to confidently implementing both legacy Feature-Policy and modern Permissions-Policy directives. You will learn to minimize your application's attack surface and protect user privacy through precise browser-level restrictions. What you'll learn: Understand the fundamental concepts of HTTP security headers and browser-level permissions; Configure Permissions-Policy and Feature-Policy to restrict access to APIs like geolocation, camera, and microphone; Control third-party iframe behaviors to prevent unauthorized feature access on your site; Analyze the differences between legacy Feature-Policy and the modern Permissions-Policy standard; Implement security policies across different environments and test their impact using browser developer tools; Combine feature controls with Content Security Policy (CSP) for a multi-layered security approach. You will begin by learning core security definitions and terminology before exploring practical header syntax and implementation strategies. Through structured written explanations and clear configuration examples, you will learn to construct robust policies step-by-step. This course is designed for beginner web developers, security enthusiasts, and systems administrators who want to strengthen their web security fundamentals. No prior experience with security headers is required. Start reading today to secure your web applications against unauthorized browser feature access.