chromium/third_party/blink/web_tests/fast/ruby/floating-ruby-text.html

<!DOCTYPE html>
<html style="font-family: Ahem; font-size: 10px; -webkit-font-smoothing: none; color: white;">
<ruby>Attempt to create a floating ruby text element. Float is not supported for ruby text, which should be apparent from the resulting render tree.<rt style="float:left">rubytext</rt></ruby>
</html>