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1 related articles

CSP Allow-list Experiment: A New Approach to Dynamic Domain Authorization via Sandboxed iframes

May 13, 2026·4 min

CSP Allow-list Experiment: A New Approach to Dynamic Domain Authorization via Sandboxed iframes

Deep dive into Simon Willison's CSP Allow-list Experiment: dynamic domain authorization via sandboxed iframes, custom fetch interception, and postMessage communication.