Board Thread:Support Requests - Designing Your Wiki/@comment-28754162-20180501075139/@comment-9605025-20180502080705

I see now. This is how they do it. They use CSS variables which I would not suggest doing unless you use the same value really really a lot. The reason being that CSS variables are not supported by older browsers, including all version of Internet Explorer. That is why I wasn't understanding your question. When I view that page using IE, the XX isn't there. - Edit:

If you go to caniuse.com and click the "Date relative" tab, you will see that no browsers supported that feature at the time IE 11 come out. In fact, even when Edge came out, only Firefox supported CSS variables.