CSCosmosBrowserUniverse

Sandbox

Live DOM, CSS, and JS sandbox

Monaco-powered split editors with a sandboxed iframe (CSP: default-src 'none'). Mutation observers, event listener inspector, and runtime error stack traces included.

HTML

live
Loading...

CSS

live
Loading...

JavaScript

live
Loading...
CSP applied inside iframe: default-src 'none'; script-src 'unsafe-inline'; style-src 'unsafe-inline'; img-src data:;

Runtime log

live

No events yet.

Mutation observer

live
  • No data yet.

Event listeners

live
  • No data yet.

DOM outline

live
  • !doctype html
  • html
  • headtitleTokenizer/title/head
  • body
  • section class="hero"Hello emworld/em/section
  • /body