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Discover how to create interactive browser-based code editors in this 35-minute conference talk from NDC London by Jo Franchetti. Learn the essentials of building developer sandboxes like CodePen or CodeSpaces that allow users to test APIs and services directly in the browser. The presentation covers implementing a code editor using TypeScript and Deno Subhosting, focusing on executing third-party code securely and affordably. Perfect for developers looking to enhance their developer experience offerings by creating controlled sandbox environments that can safely run code within the browser.