Web Reference: Jul 8, 2025 · It’s been available across browsers since July 2015. The void operator evaluates the given expression and then returns undefined. This operator allows evaluating expressions that produce a value into places where an expression that evaluates to undefined is desired. javascript:void (0) is an expression commonly found in HTML, particularly within tags. It serves to prevent the default action of a link, which is to navigate to a new page or reload the current one. The void operator evaluates any expression and always returns the primitive value undefined. The void keyword can be used as a unary operator that appears before its single operand, which may be of any type. This operator specifies an expression to be evaluated without returning a value or returning the undefined.
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