The document describes several JavaScript coding problems involving HTML forms: 1. Coding a form with 3 text fields and a button that displays the sum of the first two fields in the third read-only field when clicked. 2. Modifying the above form so that the button is initially disabled and only enabled when both first fields have values, toggling as values are added or removed. 3. Coding a form with 5 text fields that only submits when all are filled and displays an alert naming blank fields, focusing the first blank field. 4. Adding to problem 3 so that pressing return in a filled field focuses and auto-capitalizes the next field. 5. Today's