Test the modal dialog page

This page contains two forms: you can fill in the fields in the left-hand form and press the Process button, which will open a modal dialog with a Yes/No question. While the modal dialog is opened, you should not be able to navigate to any other form element (for example, the right-hand form), fill in the fields or press the buttons.

While it's easy to prevent the mouse clicks with an overlay DIV layer, it's harder to stop the keypresses (for example, TAB to navigate to other form elements and ENTER to execute a link or button action