Handling High Contrast Themes
The built-in controls automatically adjust their appearance when the user enables a high contrast theme. They adjust their colors to match the theme’s eight user-customizable colors, and in some cases they change their rendering in other ways. Because of this, your app can automatically look correct under a high contrast theme without you doing extra work. However, when you use images or hardcoded colors, which are quite common, problems arise. Images can be a problem when they convey information but do not use enough contrast. Hardcoded colors are a problem for the same reason, but also because they can make things completely unreadable when intermixed with colors that drastically change under a high contrast theme. ...
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