Browser-Native JSX and CSS Editor Lets Developers Prototype Without Local Build Tools

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A new browser-based workbench called @knighted/develop allows frontend developers to write, preview, and debug JSX and CSS directly in the browser without installing or configuring local build tools. The tool is delivered via CDN and supports multiple isolated workspaces, tabbed file editing, live previews, and in-browser lint and type diagnostics. It uses a DOM-first JSX runtime that resolves expressions to real HTML elements, bypassing virtual DOM and reconciliation overhead. Developers can also switch between React and DOM render modes, use CSS Modules, Less, or Sass, and push commits or open pull requests directly from the browser tab. The project is positioned as a lightweight solution for prototyping and focused component work, not as a replacement for full production build pipelines.

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