Principle 1 Perceivable · Guideline 1.4: Distinguishable
1.4.10 Reflow
Content must reflow into narrow viewports without horizontal scrolling.
What this means in practice
The benchmark is 320 CSS pixels – equivalent to 400 % zoom on a typical screen. Responsive layouts usually pass; wide tables and fixed containers are the usual culprits.
Normative wording
The binding text lives at the W3C. What you read here is our own faithful rendering – not a quotation.