This code must be written using both JavaScript and HTML. THE JAVASCRIPT MUST BE CALLED FROM A JAVASCRIPT FILE EXTERNALLY. Create a simple webpage that takes a username, password, and an email address. Use JavaScript to stop a user from submitting a web form unless fields are filled in. There must also be requirements for the password such as: Use an uppercase letter, a lowercase letter, and a number. These requirements must be shown to the user. Error messages must be pop up if the user does something incorrectly.