Auto focus on the first form field; done right? [closed]

1. Is autofocus attribute always set focus on first input field?
2. Why is autofocus not working?

Is autofocus attribute always set focus on first input field?

The first input or textarea in source order that has the autofocus attribute will be focused on page load. In browsers without autofocus support, no fields will be focused on page load, unless otherwise given focus with JavaScript.

Why is autofocus not working?

If the contacts on either the lens side or the camera side get dirty, communication cannot be carried out correctly, and in some cases the autofocus may not operate correctly. If the lens or camera contacts get dirty, please clean them very gently with a clean, dry cloth.