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A color wheel or color circle [1] is an abstract illustrative organization of color hues around a circle, which shows the relationships between primary colors, secondary colors, tertiary colors etc. Some sources use the terms color wheel and color circle interchangeably; [ 2 ] [ 3 ] however, one term or the other may be more prevalent in ...
The Web Content Accessibility Guidelines recommend a contrast ratio of at least 4.5:1 between the relative luminance of text and its background color [33] or at least 3:1 for large text. Enhanced accessibility requires contrast ratios greater than 7:1. However, addressing accessibility concerns is not simply a matter of increasing the contrast ...
The present W3C list is a superset of the 16 "VGA colors" defined in HTML 3.2 and CSS level 1. One notable difference between X11 and W3C is the case of "Gray" and its variants. In HTML, "Gray" is specifically reserved for the 128 triplet (50% gray) .