The following sample markup demonstrates ... elements as the user interacts with a form. Although hidden form fields and buttons are suitable in some cases, they can be unreliable.

The example form consists of five simple tables ... After adding all the fields, click the Protect Form button. Doing so disables a number of features, which will keep casual users from altering ...

Starting in macOS Sonoma, you can also click a single button to get it to help you with forms. Open any PDF file, and if Preview recognizes that it contains form elements, an AutoFill Form button ...