Buttons and links
Use a button to help a user carry out an action, such as playing audio/video, toggling a dropdown, opening a modal, etc. If you are navigating a user to a new resource, use a link.
Buttons, and links styled as buttons, need to have sufficient padding to ensure they meet WCAG Success Criterion 2.5.5: Target Size (AAA). This does not apply to links within sentences and paragraphs.
Disabled buttons can confuse some people, so only use them if testing shows that they make the user interface easier to understand.
Simple text links are given an underline, in addition to any colour treatment, to meet WCAG Success Criterion 1.4.1: Use of Color (A)
Grouping buttons and links
Buttons (and links styled as buttons) can be arranged in groups using the cluster layout: