Fab

Floating Action Button (FAB) is an action button that floats above the user interface and should be used for actions that stands out among the rest of the UI.

• Always provide an aria-label for buttons that contain only an icon.
• The label is announced by screen readers and communicates the button’s purpose.

• Disabled buttons cannot receive focus and don’t explain why they can’t be used.
• Instead, consider keeping the button active and use validation or error messages to guide the user.
• Don’t Use Tooltips on Disabled Buttons. Tooltips are not reliably available across devices or assistive technologies.

• Vivid Button: Manual accessibility test
• W3C Large links, buttons and controls