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Bailey, Robert
Web Usability
2002

Abstract:

No Web page fonts should be less than 10-points, Optimal reading speed for most adults will be elicited with 12-point fonts (size=3). There is probably no reliable difference in reading speed for most adults when viewing common font styles (Arial, Verdana, Georgia, Times New Roman). Most users tend to prefer sans serif fonts (Arial, Verdana). Older users will benefit from type sizes that are at least 14-points.