Graphical form buttons should have "alt" text

[joaooliveira]

Why is this important?

A blind user cannot see a graphical form button and they would be reliant on a screen reader to interpret what the form button does. Adding an alt attribute provides the description on what the button does. 

How can I resolve this issue?

Add an alt attribute describing the purpose of the button 

What topics do this checkpoint affect?

• Accessibility (WCAG 2.1 Level A, 1.1.1)
• Legal

Can you explain how this checkpoint works?

The checkpoint examines the page and reports if any <input type="image"> element does not have alternative text.

References

• Understanding Success Criterion 1.1.1: Non-text Content
• H36: Using alt attributes on images used as submit buttons
• G94: Providing short text alternative for non-text content that serves the same purpose and presents...