HTML display result in text (input) field?

Question

I have a simple HTML form, with 3 input field, when you hit = button, it suppose to add 2 numbers that you typed in the first 2 input fields and display result in 3rd filed.

Answer 1

Do you really want the result to come up in an input box? If not, consider a table with borders set to other than transparent and use

document.getElementById('sum').innerHTML = sum;