Disclaimer
Limitations of browser sandboxing, previews, and educational tooling.
Preview differences
A sandboxed iframe preview can differ from a full standalone webpage, especially around permissions, storage partitioning, and third-party resource behavior.
Security
Sandboxing isolates preview code from the parent UI, but it does not mean absolute security. Treat untrusted code carefully.
Educational purpose
Examples and guides are for learning and prototyping. Validate accessibility, performance, and security in your own environment before shipping.
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A fast browser-based HTML, CSS and JavaScript development playground.