write a program in javascript to find out the grades

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write a program in javascript to find out the grades.?

The MarkToGrad function scrapes the student mark out of the mark-input-box element and verifies it is realistic. ? A Mark must be number only, nonnegative, and less than 101. ? If an invalid mark is entered, it displays a message back to the user in the .validation-message element. ? Messages should be informative... return as many different messages as you can to guide the user what kind of erroneous value has entered ? If the user entered any value above 90 Grade A should be displayed as a result ? If user entered any value above 80 Grade B should be displayed ? If user entered any value above 70 Grade C should be displayed ? If user entered any value above 50 Grade D should be displayed ? If user entered any value less than 50 Grade F should be displayed ? Hint 1: In JavaScript, we can use the global parseInt function to try and convert a string to a number. ? Hint 2: Use exception handling. ? Hint 3: Use HTML and JavaScript