Zoom disabled by meta viewport Accessibility Checkpoint

Description

Do not use the meta viewport tag to disable zoom.

Help

Setting user-scalable=no or maximum-scale to less than 2.0 prevents zooming small text to make it readable. Note that iOS 10+ ignores this setting.

Applicable standards

• ACT Rules b4f0c3
• WCAG 2.0 (Success Criteria: 1.4.4 level AA)
• WCAG 2.1 (Success Criteria: 1.4.4 level AA)
• WCAG 2.2 (Success Criteria: 1.4.4 level AA)
• Section 508 (2017) (Success Criteria: 1.4.4 level AA)

Note: Section 508 Refresh (2017) checkpoints are equivalent to WCAG 2.0 level A and level AA checkpoints.

Change history

• 6.55 Nov 2024 Updated to match meta viewport implementations in Chrome and Safari.
• 6.51 Dec 2023 Updated to match ACT Rule PR 1994.
• 5.37 May 2020 Negative values for maximum-scale are ignored.
• 5.36 Jan 2020 Added.

This page describes a web site issue detected in HTML documents by SortSite Desktop and OnDemand Suite.

Rule ID: AccHtmlMetaViewportNoZoom