guideline: Predictable
Make sure websites and apps behave in consistent and expected ways, so people aren’t surprised or confused by unexpected changes.
WCAG 2.0, 2.1, 2.2
Level A
3.2.1 On Focus
Nothing unexpected changes when something on the page receives keyboard focus, like a <button>
WCAG 2.0, 2.1, 2.2
Level A
3.2.2 On Input
Nothing unexpected happens when a form field value is selected, like picking an option from a dropdown menu.
WCAG 2.0, 2.1, 2.2
Level AA
3.2.3 Consistent Navigation
Navigation is consistent from page to page.
WCAG 2.0, 2.1, 2.2
Level AA
3.2.4 Consistent Identification
Things that carry out a particular function must always look and work the same.
WCAG 2.0, 2.1, 2.2
Level AAA
3.2.5 Change on Request
Major changes in the user interface should only happen when users intentionally trigger them, typically with a button or link.
WCAG 2.2
Level A
3.2.6 Consistent Help
Some form of help is available from every page.
