When we talk about accessibility, we tend to talk about many things — such as dark mode, keyboard navigation, prefers-reduced-motion, and screen readers — but there is one thing that does not receive that much attention: Windows High Contrast Mode (from now on, abbreviated as WHCM). This is a tendency I have seen in some websites at a point where we have normalized some practices that can harm users’ experience in WHCM. In this article, I want to explain what it is and give a good set of practices we can keep in mind to make our sites more usable with this mode.