Execute sandboxed JS in a page.

• Create web worker executor
• Make it an embeddable Web Components. See branch feature/as-web-components.
• Add more output rendering options. See Algorithm Visualizer for inspiration.
• Custom inputs instead of just window.prompt or window.confirm.
• Improve UI.
• Improve documentation.
• Compatibility with dwitter! - Almost. Check this out!
• Allow sharing code via URL only and no server-side.

• https://replit.com/
• https://observablehq.com/
• https://runkit.com/home