UPDATE - You CAN now set the browser to emulate high contrast mode in the dev tools. This works in Edge 98 and Chrome 98. Go to dev tools, select "More tools" menu, select "Rendering", then scroll down to "Emulate CSS media feature forced-colors", choose active and the browser will re-render the page in a high contrast mode.
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UPDATE - You CAN now set the browser to emulate high contrast mode in the dev tools. This works in Edge 98 and Chrome 98. Go to dev tools, select "More tools" menu, select "Rendering", then scroll down to "Emulate CSS media feature
forced-colors", chooseactiveand the browser will re-render the page in a high contrast mode.