一般的网页可用性设计指南推荐使用有高色彩对比度的sans - serif字体(高对比度的白字黑底或白字暗蓝底，而不是像Chadwick低对比度的蓝字蓝底)。
General web usability guidelines recommend sans-serif fonts with high contrast color selection (high-contrast white on black or dark blue rather than low-contrast like Chadwick's blue-on-blue).
对比度确定了显示器能看到的细节程度。对比度越高，色彩更丰富、线条更清晰。
Contrast ratio determines the level of detail that can be seen on the display, with the higher ratio providing richer color and crisper lineation.
比起大范围的对比度，人眼和大脑更在意小范围内的对比度。
It turns out though that the eye and brain care more about small scale contrast than large scale contrast.
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