Chromium doesn't support the display values defined by css-ruby spec:
ruby | ruby-base | ruby-text | ruby-base-container | ruby-text-container

Spec: https://drafts.csswg.org/css-ruby/#ruby-display

Excerpt from a comment by futhark@ at (https://bugs.chromium.org/p/chromium/issues/detail?id=868102#c10):
> The ruby elements in the HTML spec are styled in the UA sheet
> with these values and Edge and Firefox supports them.
> We probably should too.