When there are problems in data input, it says something about looking for the entries highlighted in red. When the computer is in high contrast mode, the red highlight is not shown. I would appreciate an option to use symbols or text-decoration or similar to highlight errors instead, so they can be seen. Thank you!
(In Firefox settings, there's an option marked "Colors" that can be set to override page colors, either when the OS uses a high-contrast system theme — I think that's the default — or always. I don't know if it applies to other Web browsers.)