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jsaul... If you're still confused, think of it this way: by declaring
body { font-size: 62.5%; ... }you're setting your base font size to 10 pixels. If you want all of your paragraphs to be 12 pixels, you declare
p { font-size: 1.2em; ... }or
p { font-size: 120%; ... }If you have a user who has trouble with smaller fonts, your solution is flexible. Maybe they increase their browser's default font size to 24px instead of 16px. Then your base font size is 15px instead of 10px, and your paragraphs as sized at 18px instead of 12px. This is the ideal solution for accessibility because it puts control in the hands of your users. Most users will probably see your default font sizes, but it's the outliers you have to worry about. If you start by declaring
body { font-size: 10px; ... }all of your users are stuck at 10px regardless of whether they can read it or not. Firefox still allows them to increase the font size, but IE doesn't.
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