Understandable / 3.2 Predictable

3.2.1On Focus

Level A

Receiving focus alone must not trigger a change of context such as page navigation or opening a modal.

Normative References

Success Criterion 3.2.1 On Focus — WCAG 2.2(opens in a new tab)The normative requirement text.
Understanding On Focus — W3C(opens in a new tab)Official guidance on intent, examples, and techniques.