Accessibility
- Always use a
label. Use a hidden label, or a title or aria-label attribute when a visible text label is not needed.
- Associate form labels with controls.
- Never replace
label with placeholder text.
- Always specify the correct input type (e.g.
date, email, tel, number)
- Match
for and id values that associate the label with its form control. Because id attribute values must be unique on each page, a form control can only have one associated label.
- Whenever possible use
autocomplete to help users (especially users with cognitive disabilities) fill out the form.
- On required fields, use the
required attribute. It will cause screen readers to announce “required” and also triggers the browser to warn the user with a visual tooltip if the user leaves the filed blank. Screen readers also announce the tooltip content with it appears.
- When performing form validation, apply the
aria-invalid="true" attribute to a form control. It will cause the screen reader to announce “invalid” when that control gets the focus.
- Use
aria-labelledby to overcome the 1:1 limitations of label.
- Use
aria-describedby (in addition to a label) to associate descriptive text to the form control.
- Make sure the form is keyboard accessible: all input fields need to be focusable. The “Tab” sequence needs to be logical and intuitive.
- Do not rely on JavaScript alone for form submission, validation, and error recovery.
- Prompt the user of any validation errors in an apparent and accessible manner. Provide informative feedback messages.
- Allow the user to easily access the form controls that need to be modified.
- Allow resubmission and revalidation of the form information.
