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How to fix horizontal scroll at 320 CSS px (WCAG 1.4.10 Reflow) — WCAG and remediation guide
Horizontal scroll at 320 CSS px (WCAG 1.4.10 Reflow) is one of the most-reported WCAG failures in automated audits. This guide explains the WCAG criterion involved, common causes, and a tested remediation pattern that resolves the issue at source.
What is "horizontal scroll at 320 CSS px (WCAG 1.4.10 Reflow)"?
In a typical automated audit (axe-core, Lighthouse, WAVE) the rule for horizontal scroll at 320 CSS px (WCAG 1.4.10 Reflow) flags elements that violate the corresponding WCAG success criterion. The fix is at source code — not via overlay or runtime patching.
Why this matters
Horizontal scroll at 320 CSS px (WCAG 1.4.10 Reflow) affects users of assistive technology — particularly screen-reader users, low-vision users, and keyboard-only users — and is one of the most-cited failures in ADA and EAA enforcement actions.
How to fix it
Identify the offending element via the audit report; apply the source-level remediation; re-test with the same automated tool; verify with manual review using NVDA or VoiceOver. If the issue is content-driven, fix in your CMS and update editorial workflow.
How to prevent regression
Add axe-core to your CI pipeline. Pair-review accessibility on every PR. Bake correct patterns into your component library so new screens cannot reintroduce the same failure.
FAQ
Frequently asked questions
Cited answers. Sourced. Updated as standards and case law change.
Is horizontal scroll at 320 CSS px (WCAG 1.4.10 Reflow) a Level A or Level AA WCAG issue?
Most common horizontal scroll at 320 CSS px (WCAG 1.4.10 Reflow) failures sit at Level A (the minimum baseline) or Level AA (the legally required target). Severity varies by user impact; an IAAP-credentialed reviewer can grade individual instances.
Can an accessibility widget fix horizontal scroll at 320 CSS px (WCAG 1.4.10 Reflow)?
No. Widgets do not modify the underlying source code. Source-level remediation is the only durable fix and the only fix recognised by US courts and EU market-surveillance authorities.
How often does horizontal scroll at 320 CSS px (WCAG 1.4.10 Reflow) appear in real audits?
Horizontal scroll at 320 CSS px (WCAG 1.4.10 Reflow) appears in approximately 30–60% of audits in the WebAIM Million dataset, depending on which top-million page sample is analysed.
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