WCAG 3.2.2
Level A
Understandable
3.2.2 On Input
Changing a setting (e.g. a select) does not automatically cause an unexpected change of context.
What 3.2.2 On Input means
Choosing an option does not submit the form or reload without warning.
How to test
Change form controls and confirm no surprise navigation/submission.
How to meet it
Require an explicit submit; warn users if a control will change context.
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Official reference: Understanding 3.2.2 On Input (W3C)
More Understandable criteria
3.1.1 Language of Page
3.1.2 Language of Parts
3.2.1 On Focus
3.2.3 Consistent Navigation
3.2.4 Consistent Identification
3.2.6 Consistent Help
3.3.1 Error Identification
3.3.2 Labels or Instructions
3.3.3 Error Suggestion
3.3.4 Error Prevention (Legal, Financial, Data)
3.3.7 Redundant Entry
3.3.8 Accessible Authentication (Minimum)