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Method and example
Encoding supports legacy JavaScript/JSON-style UTF-16 escapes, JavaScript code-point escapes, U+ notation, and HTML numeric references. Decoding is strict and syntax is chosen explicitly.
😀 encodes as \uD83D\uDE00 in legacy UTF-16 notation, \u{1F600} in JavaScript code-point notation, and 😀 in HTML hexadecimal notation.
Compatibility and limits
No Unicode normalization occurs. JavaScript \u{...} is not valid JSON syntax. Lone surrogates, values above U+10FFFF, surrogate scalar values, malformed tokens, and mixed syntaxes are rejected.
Technical output regions scroll internally on narrow screens. Copying occurs only after a button press, and unsupported or malformed input produces a controlled message.
Security and accessibility
All input is handled as inert text. HTML-like content is never executed or fetched. Unicode formatting, symbols, and invisible characters can be difficult for assistive technology; use ordinary labeled text for essential information.