What is a "Successful" Control ?
A control is said to be a successful control if it is valid for submission. In order to qualify as a successful control, it must be defined inside a FORM element and must have a control name.
Ok. So if a form contains three submit buttons, which ones, if any, are successful controls?
Only 1 submit button, the active submit button, will be the successful control.
Can disabled controls be successful?
No.
What about radio buttons and checkboxes?
Only the “on” radio buttons and “on” checkboxes can be successful.