2.1.11 [ECMA-262/5] Section 15.7.4.5, Number.prototype.toFixed (fractionDigits)

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V0033:

The specification states:

 An implementation is permitted to extend the behaviour of toFixed for values of fractionDigits less than 0 or greater than 20. In this case toFixed would not necessarily throw RangeError for such values.

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If any value of the fractionDigits function is converted to an integer and it is equal to +∞ or -∞, this value is treated as if it is the value 0.