8.24 WCAG 2.1 Success Criterion 3.3.2 − Labels or Instructions
To help persons with disabilities avoid making mistakes, it is good to provide simple instructions and cues for entering information into forms. For example, use labels, instructions and examples.
Before Rectification
The above screen is a typical “Contact Us” form. However, there is no information on what format to use to enter the phone number.
After Rectification
By adding default instructions to the fields, a visually impaired person can complete each field easily.
WCAG 2.1 Reference:
https://www.w3.org/WAI/WCAG21/Understanding/labels-or-instructions