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Strict mode

ECMAScript 5's strict mode is a way to opt in to a restricted variant of JavaScript. Strict mode isn't just a subset: it intentionally has different semantics from normal code. Browsers not supporting strict mode will run strict mode code with different behavior from browsers that do, so don't rely on strict mode without feature-testing for support for the relevant aspects of strict mode. Strict mode code and non-strict mode code can coexist, so scripts can opt into strict mode incrementally.
ECMAScript5 JavaScript Strict Mode

ReferenceError: deprecated caller or arguments usage

A strict-mode-only warning that a ReferenceError occurred. JavaScript execution won't be halted.
Errors JavaScript Strict Mode Warning