Keyboard shortcut
Press Ctrl + Enter or ⌘ + Enter to run. Tab remains normal keyboard navigation.
Browser playground
Edit, run, inspect, repeat.
Run a real ES module against the deployed package source. Every run starts in a fresh opaque-origin sandbox that cannot read this page's origin, storage, or cookies.
Check the console or DevTools.
Console output is mirrored into the panel below, including recognized ansi-colors-es6 styling, and remains available in your browser's developer tools.
ES module
Console
Fresh sandboxPreparing the isolated runtime…
Loading package source…
What the sandbox does
It runs one module with the vanilla-test package specifier available. A restrictive sandbox policy blocks ordinary network requests, a 15-second watchdog resets stalled runs, and mirrored output is bounded.
Need a production-ready pattern? Start from a complete adapter, then use the API contracts to handle results and events.