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WCAG 2.0 and Text Sizes

WCAG 2.0 does not specify a minimum text size—1 pixel font would be compliant, though obviously inaccessible to all sighted users. Font sizes should generally be at least 10 pixels.

WCAG 2.0 Success Criterion 1.4.4 (Level AA) requires that content must remain readable and functional when text size or page zoom is set to at least 200% or twice the default size. This can be tested by selecting Control + (or Command + on a Mac) in your web browser or by increasing the text size under the View menu. The 200% text sizing requirement can be very difficult to meet on many pages. However, it is very uncommon for end users to need text sizing this big. Any user requirements over around 150% would necessitate page zooming or a dedicated screen enlarger. While supporting 200% text sizing ensures significant flexibility for end user text sizing, effort may best be spent achieving a more reasonable requirement of 150% text sizing.

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