CSS ruby-position Property Reference

The CSS ruby-position property is a standard property in CSS Ruby. Review its formal syntax, computed behavior, and practical declarations.

Updated 2026-08-12

ruby-position overview

The CSS ruby-position property is a standard property in CSS Ruby. Review its formal syntax, computed behavior, and practical declarations.

The computed value normally inherits from the parent element when no declaration wins the cascade.

Syntax and formal definition

ruby-position formal syntax

Field	Value
Formal syntax	[ alternate \|\| [ over \| under ] ] \| inter-character
Initial value	alternate
Applies to	rubyAnnotationContainers
Inherited	Yes
Percentages	no
Computed value	asSpecified
Animation type	discrete
Media	visual
Specification group	CSS Ruby
Status	Standard

Practical examples

These declarations demonstrate valid ways to set ruby-position. The initial and inherit global keywords remain available even when a property-specific value is preferable.

ruby-position live example

CSS

.reset-example {
  ruby-position: initial;
}

.inherit-example {
  ruby-position: inherit;
}

@supports (ruby-position: initial) {
  .supported {
    ruby-position: initial;
  }
}