What else can be checked in a form from non-functional testing?

In non-functional testing of a form, you can check:

• Performance: response time of the form during loading and submission.
• Usability: ease of use and clarity of the interface, logical placement of elements.
• Compatibility: correct display and functioning of the form across different browsers and devices.
• Security: vulnerability checks, such as XSS through input fields.
• Accessibility: compliance with accessibility standards for people with disabilities.
• Load testing: how the form behaves under a large number of simultaneous users.
• Localization: correct display of text and formats for different languages and regions.

For example, you can verify that the form does not slow down when entering a large volume of data or that form elements are accessible for keyboard navigation.