A Mark Tag allows you to jump from one place in a form to another. It's like a placeholder or bookmark in the form. A Link Tag is needed to send the user to a Mark.
The required parameter is name.
Note for example below: To switch views between the Active Form and Markup Code, click on "View" in the upper right of this page. Then choose "Form" to see the Active Form or choose "Markup" to reveal the Markup Code.