Spec web page word highlight feature has low contrast in dark mode

[greggman]

Some feature of the spec web page seems to highlight words clicked on, but those words have low-contrast in dark mode

related: #3649

[greggman]

adding

@media (prefers-color-scheme: dark) {
  var[data-var-color] {
     color: black;
     filter: invert(1);
  }
}

Might solve it.

[kainino0x]

Don't think we're using any custom styling here, so this is a Bikeshed issue. Found speced/bikeshed#2157

[litherum]

Should this issue be closed and marked as "moved?"

[kainino0x]

I think I'd like to keep it open here since it's still an active problem with our spec. Maybe one of us will go contribute a fix to Bikeshed (or make a quick patch in our spec, though fixing bikeshed shouldn't be hard)