Gecko supports ruby-position without prefix, with value over/under (inter-character not supported in Gecko yet AFAICT). https://drafts.csswg.org/css-ruby/#rubypos Prefixing policy http://www.w3.org/TR/css-2015/#de-facto So maybe fix bug 141420 first and then ask for a CSSWG resolution to unprefix this?
Chrome will ship the unprefixed ruby-position. https://t.co/nmCPv0Onhk
What is this blocked on?
<rdar://problem/86128259>
Ideally this would add animation support for this property in CSSPropertyAnimation. See the many uses of DiscretePropertyWrapper, this will likely be a one-liner.