This is a cool. It's something I've toyed with putting into my toy font renderers but it always seemed like it had a lot of edge cases. Length of the ruby text

This is a cool. It's something I've toyed with putting into my toy font renderers but it always seemed like it had a lot of edge cases. Length of the ruby text overflowing the width of the parent, in some to most cases a little overflow is ok but it's certainly not guaranteed. Scaling down the ruby text isn't the ideal solution because it quickly becomes unreadable. The other option is to scale the spacing in the parent text, which seems to be done for <ruby>境界面<rt>インターフェース</ruby> in the specification https://html.spec.whatwg.org/multipage/text-level-semantics.html#the-ruby-element https://html.spec.whatwg.org/multipage/text-level-semantics.... but then that's going to impact the line wrapping and so on. Kudos to the implementators!