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I think WCAG 2.0 AA is to “complicated” and recomend WCAG A plus Contrast (3.2.2) and especially Focus indication (2.4.7) for keyboars users.
It isn’t statistics, but an example of 50 E-Retail sites http://jimthatcher.com/eretailers.htm. (a paper at last year’s CSUN conference)
I think WCAG 2.0 AA is to “complicated” and recomend WCAG A plus Contrast (3.2.2) and especially Focus indication (2.4.7) for keyboars users.
It isn’t statistics, but an example of 50 E-Retail sites http://jimthatcher.com/eretailers.htm. (a paper at last year’s CSUN conference)