The 'ruby-position' CSS property controls the position of ruby annotation. It's the unprefixed version of the '-webkit-ruby-position' property. This property has three possible keywords: 'over', 'under', and 'inter-character'. For now, only the first two are being implemented. This change creates feature parity with Firefox.
Firefox supports no '-webkit-ruby-position', but 'ruby-position'. Shipping 'ruby-position' improves browser interoperability and websites don't need to rely on the vendor-prefixed '-webkit-ruby-position'.
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