WCAG 1.4.10
Level AA
Perceivable
1.4.10 Reflow
Content reflows into a single column at 320px width (400% zoom) without two-dimensional scrolling.
What 1.4.10 Reflow means
Users who zoom heavily do not have to scroll both horizontally and vertically.
How to test
Zoom to 400% (or 320 CSS px wide) and confirm no horizontal scrolling for text content.
How to meet it
Use responsive, single-column reflow; avoid fixed-width containers and horizontal scrolling.
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Official reference: Understanding 1.4.10 Reflow (W3C)
More Perceivable criteria
1.1.1 Non-text Content
1.2.1 Audio-only and Video-only (Prerecorded)
1.2.2 Captions (Prerecorded)
1.2.3 Audio Description or Media Alternative (Prerecorded)
1.2.4 Captions (Live)
1.2.5 Audio Description (Prerecorded)
1.3.1 Info and Relationships
1.3.2 Meaningful Sequence
1.3.3 Sensory Characteristics
1.3.4 Orientation
1.3.5 Identify Input Purpose
1.4.1 Use of Color
1.4.2 Audio Control
1.4.3 Contrast (Minimum)
1.4.4 Resize Text
1.4.5 Images of Text
1.4.11 Non-text Contrast
1.4.12 Text Spacing
1.4.13 Content on Hover or Focus