Summary & Key Takeaways ​

• Simon Willison investigates if JavaScript can bypass a Content Security Policy (CSP) set via a meta tag within an iframe.
• The article delves into the intricate interactions between JavaScript, CSP, and iframe security contexts.
• It likely explores potential attack vectors and browser security mechanisms in this specific scenario.
• The goal is to assess the robustness of CSP when defined within a meta tag inside a nested iframe.

Out Commentary ​

The question itself is fascinating – the interplay of CSP, iframes, and meta tags can be incredibly subtle, and it's often in these edge cases that vulnerabilities are found. It's a stark reminder that web security is a constant cat-and-mouse game, and understanding these low-level interactions is crucial for building truly secure applications.