WCAG 3.2.1
Level A
Understandable
3.2.1 On Focus
Receiving focus does not trigger an unexpected change of context.
What 3.2.1 On Focus means
Tabbing to a field does not suddenly navigate or open a new window.
How to test
Tab through controls and confirm nothing unexpected happens on focus.
How to meet it
Do not auto-submit or navigate on focus; trigger changes on explicit activation only.
Need help meeting 3.2.1?
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Official reference: Understanding 3.2.1 On Focus (W3C)
More Understandable criteria
3.1.1 Language of Page
3.1.2 Language of Parts
3.2.2 On Input
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)