The <form> element should only map to FORM landmark with restriction of accessible name #106

The following condition should be added for the form element to become a form landmark:

"The form role if the form element has an accessible name. Otherwise, no corresponding role."

This is the similar to the section element becoming a region landmark requirement.

This is important since many frameworks including .NET wrap an entire web page in a FORM element, obviously not very functional as a landmark.