Answered the questio on line 23 & 24.

Author: ahmadehsas

Sprint-1/4-stretch-explore/chrome.md

@@ -19,3 +19,10 @@ What effect does calling the `prompt` function have?
 It opens a popup asking for the user’s name, and lets the user type something.
 What is the return value of `prompt`?
 A string that contains what the user typed (e.g. “Ahmad”).
+
+If we were writing a program that uses prompt() to ask for an input value, how could
+the program check if the user clicked "OK" or "Cancel"?
+
+If the user clicks **OK**, it returns the string they typed, even an empty string when there is nothing written.
+
+If the user clicks **Cancel**, it returns null.