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@derSchepp @webkit I wasn’t aware, either. Apparently
__qem
s are really old though. I could trace them back to 2002, to chromium.googlesource.com/chromium/blink/+/6e7c9ac1d5a4d8fd895f32713b2cc4f1b4a6bedb/WebCore/khtml/css/html4.css, back then using just one underscore (_qem
). meiert.com/en/blog/user-agent-style-sheets/