In this project assignment, you'll make this application display a prompt dialog box like the one below that gets a dfgrrdnumber grade from $0$ through $100$ :

This page says

Enter number grade from $0$ through $100$

Or enter $999$ to end entries

Then, it should display on the page letter grades for the numbers the user entered:

Show letter grade

Grade $80=B$

Grade $99=$ A

Grade $67=D$

To derive the letter grade, you should use this table:

A $88-100$

B $80-87$

C $68-79$

D $60-67$

$F<mn\; id="EditorElement\_4578761">6</mn><mn\; id="EditorElement\_4578762">0</mn>$

Instructions

Download the following project file: letter grade.html darr

In the script element, add the attribute to link an external JavaScript file named letter$\_$grade.js$.$

Create the file letter$\_$grade.js and add the JavaScript code for getting the user's entry while the entry amount isn't $999.$ This should provide for multiple

entries and conversions.

Add the JavaScript code for deriving the letter grade from the table above and displaying it on the page.

If you haven't already done so$,$ add data validation to make sure the entry is a valid number from $0$ through $100.$ If the entry is invalid, the application

should just display the starting prompt dialog box. It doesn't need to display a special error message.