Question

When will the fourth argument to open() useful?

(a) When the second argument names a retired window

(b) When the first argument names an existing window

(c) When the second argument names an existing window

(d) When the first argument names a retired window

The question was posed to me in exam.

The question is from Error Handling topic in division Document Object Model and Event Handling in Javascript of JavaScript

Answer 1

Correct option is (c) When the second argument names an existing window

For explanation I would say: The fourth argument to open() is useful only when the second argument names an existing window. This fourth argument is a boolean value that indicates whether the URL specified as the first argument should replace the current entry in the window’s browsing history (true) or create a new entry in the window’s browsing history (false). Omitting this argument is the same as passing false.