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A fully functional text editor built from scratch in raw JavaScript — zero frameworks, zero libraries. At its core is a gap buffer, a contiguous array split into two halves by a movable gap sitting at the cursor position.
An interactive playground for time-based one-time passwords. Generate a secret, scan the QR with your own authenticator app, watch the six digits roll over every thirty seconds, and verify what your phone produces. Every code is computed in the browser with the Web Crypto API — the page makes no network calls at all.