WCAG 2.1 SC 3.2.1: On Focus (Level A)
3.2.1 On Focus (Level A) — what it requires, a common failure example, and how to fix it. Part of WCAG 2.1's 3.2 Predictable guideline under the Understandable principle.
WCAG 2.1 guidelines hub → Understandable → 3.2 Predictable
3.2.1 On Focus (Level A)
Predictable is about not surprising the user. Interfaces should behave consistently, and nothing should move focus or change context without the user asking it to — this matters enormously for screen-reader and switch-device users, who lose their place entirely when something changes unexpectedly.
This page is educational technical reference material, not legal advice. Meeting WCAG 2.1 does not by itself determine legal compliance with the ADA or any other law — consult qualified counsel for legal risk questions.
Plain-language explanation: Simply moving keyboard focus onto an element (tabbing to it) must never trigger a major change — no page navigation, no form submission, no new window opening — on its own.
Common failure: A <select> dropdown for “Ship to country” automatically submits the form and reloads the page the instant it receives focus, before the user has even chosen an option, because a change handler fires on focus rather than on an explicit selection.
Remediation: Trigger context changes only on explicit user actions — a selection change (onchange after a value is actually picked) or a button press — never on onfocus alone.
In this guideline — 3.2 Predictable: 3.2.1 On Focus (A) · 3.2.2 On Input (A) · 3.2.3 Consistent Navigation (AA) · 3.2.4 Consistent Identification (AA) · 3.2.5 Change on Request (AAA)
Next: 3.2.2 On Input (A) →
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This page is educational content about technical accessibility practice, not legal advice. Meeting WCAG 2.1 does not guarantee legal compliance with the ADA or any other law. Consult qualified counsel for legal risk questions.
This page was drafted with AI assistance and reviewed by a person for accuracy before publication.