Best practice for font family and font color

ADA and visually speaking, what is the best font family & font color combination on a white background web page. Please provide sound reasoning in your answer.
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The best font family is a sans-serif font like Arial.  This is better than things Times New Roman on web pages.  
Sans-serif fonts are those where the letters are simpler and don't have serifs extra curves, etc (A fine line finishing off the main strokes of a letter).  Another common one is Helvetica

Studies have been done and they show that for printed material serif fonts, like Times New Roman, are easier on the eyes, however, on the screen the same studies found that san-serif fonts are easier on the eyes.
gwr477Author Commented:
Thanks, how about the font color question?
Black.  It provides the best contrast to white.  If you go with another color (say for highlighting or links or something) pick dark colors that are distinct like red, blue, green  - These are the most distinct since pixels are done in RGB (Red, green, blue), but black is the darkest since it is a lack of all of these.

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Fonts Typography

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