chromium/src/third_party/blink/web_tests/external/wpt/css/css-ruby/support/ruby-common.css

rbc {
  display: ruby-base-container;
  unicode-bidi: isolate;
}
[pseudo] {
  font-size: inherit;
  line-height: inherit;
}
[pseudo] > rt {
  font-size: 50%;
}
[pseudo] > rt[pseudo] {
  font-size: inherit;
}

.large {
  font-size: 200%;
}