WCAG Compliance: 1.4.3 Contrast

[owenslo]

We are verifying and improving Runestone's level of WCAG compliance to Level AA, our findings are summarized on a Google Doc here. This is for guideline 1.4.3 1.4.3 Contrast (Minimum): The visual presentation of text and images of text has a contrast ratio of at least 4.5:1, except for the following: (Level AA) Large Text: Large-scale text and images of large-scale text have a contrast ratio of at least 3:1; Incidental: Text or images of text that are part of an inactive user interface component, that are pure decoration, that are not visible to anyone, or that are part of a picture that contains significant other visual content, have no contrast requirement. Logotypes: Text that is part of a logo or brand name has no minimum contrast requirement.

In order to meet this guideline, we need to make sure that the text has a contrast ratio of at least 4.5:1, except for the what text can be excluded. Part of the Berea College Open Source Class @clarkh97 @owenslo @EzraSkwarka