The 10 Commandments of Good Form Design on the Web – Mono
1. Thou shalt provide clear, always visible labels for each field 2. Thou shalt use a big enough font size 3. Thou shalt provide easily 4. Thou shalt size the input fields according to their expected input 5. Thou shalt not customize checkboxes and radio buttons 6. Thou shalt provide both a general error message and a field specific one 7. Thou shalt make it clear what is optional and what is not 8. Thou shalt hide what is not needed until it is needed 9. Thou shalt minimize user input 10. Thou shalt be clear what type of input is expected