-ms-high-contrast is a ie/old edge only feature. the prefers-contrast is an option however the website creator would need to add this to their page.

A possible workaround would be to Change the fonts and colors websites use

These browsers support the -ms-high-contrast feature: Google Chrome: 90.0.4430.93 (official build, 64 bit) Microsoft Edge: 90.0.818.51 (official build, 64 bit) Opera: 76.0.4017.94 As of May 7, 2021 these are the latest versions of browsers. Please support the -ms-high-contrast function.

Mick is right, we're not going to support -ms-high-contrast. It is not standarized. The High contrast mode will be supported in every browser with a forced-colors feature.

https://blogs.windows.com/msedgedev/2020/09/17/styling-for-windows-high-contrast-with-new-standards-for-forced-colors/ https://developer.mozilla.org/en-US/docs/Web/CSS/@media/forced-colors

Then we can only use Google Chrome, Opera or Edge. Why do you deny us the visually impaired, but they do not?

I'm pretty sure that Google Chrome, Opera and new Edge also doesn't understand nor support -ms-high-contrast.

No, it’s not. Open the link: https://onedrive.live.com/ Register if needed. And open the document editor in different browsers. Examine the code.