--- title: I built a static XSS playground that runs payloads safely in the browser ---

Short summary

Ahmed Remi built XSS Payload Lab, a fully static React app that safely teaches XSS vulnerabilities using sandboxed iframes that isolate payloads from the parent page by blocking same-origin access and network requests. The interactive tool features a payload library, fix-the-sink challenges, and a CSP playground to demonstrate that correct HTML encoding and safe DOM APIs are fundamentally more important than Content Security Policy for preventing XSS attacks.

• •Built a sandboxed XSS learning environment using iframes isolated from the parent page
• •Includes interactive challenges, payload library, and CSP playground for hands-on learning
• •Demonstrates that correct encoding and safe DOM APIs matter more than relying on CSP alone

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