What does the constant TYPE_BACK_FORWRD indicate?

What does the constant TYPE_BACK_FORWRD indicate? Correct Answer Navigation via browser history

TYPE_BACK_FORWARD performs navigation through a history traversal operation. TYPE_BACK_FORWARD Has the value of 2, indicating that the page was navigated to via the browser history, either using the back or forward buttons or programmatically through the browser’s history object.
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