WCAG 2.1 SC 3.2.2: On Input (Level A)
3.2.2 On Input (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
3.2.2 On Input (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: Changing a form control’s value or setting also shouldn’t automatically trigger a major context change, unless the user has been told in advance that it will.
Common failure: Selecting a different size in a product-variant dropdown silently navigates the browser to a completely different product page rather than just updating the price/image shown, with no warning that selecting a value would do this.
Remediation: Update content in place via JavaScript instead of forcing navigation, or if navigation genuinely has to happen, tell the user up front (e.g. “Selecting a size will show that size’s product page”).
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)
← Previous: 3.2.1 On Focus (A) · Next: 3.2.3 Consistent Navigation (AA) →
↑ Back to the Understandable overview · Full WCAG 2.1 wiki
See a sample report or check pricing — $890 one-time, $99/month for ongoing re-checks after fixes ship.
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.