Complete chrome.md stretch exercise

Author: lwandogwele52-ui

Sprint-2/4-stretch-explore/chrome.md

@@ -8,8 +8,10 @@ Let's try an example.
 In the Chrome console, invoke the function `alert` with one argument, the string `"Hello world!"`;
 
 What effect does calling the `alert` function have?
-
+Answer: Calling alert("Hello world!") displays a pop-up dialog box in the browser window containing the message "Hello world!" and an "OK" button that pauses script execution until dismissed.
 Now try invoking the function `prompt` with a string input of `"What is your name?"` - store the return value of your call to `prompt` in an variable called `myName`.
-
 What effect does calling the `prompt` function have?
+Answer: Calling prompt("What is your name?") displays a pop-up dialog box containing the message, a text input field, an "OK" button, and a "Cancel" button.
+
 What is the return value of `prompt`?
+Answer: It returns the string entered by the user in the input field when they click "OK". If the user clicks "Cancel" or closes the dialog, it returns null.