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MSDN Library

Infinity Constant (JavaScript)

Returns an initial value of Number.POSITIVE_INFINITY.

Infinity 

The Infinity constant is a member of the Global object, and is made available when the scripting engine is initialized.

The Infinity property was introduced in Internet Explorer before Internet Explorer 6 and was made read-only in Internet Explorer 9 standards mode.

Applies To: Global Object (JavaScript)

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