ruby-position

This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.

Summary

The ruby-position CSS property defines the position of a ruby element relatives to its base element. It can be position over the element (over), under it (under), or between the characters, on their right side (inter-character).

Initial valueover
Applies toruby annotations containers
Inheritedyes
Mediavisual
Computed valueas specified
Animation typediscrete
Canonical orderthe unique non-ambiguous order defined by the formal grammar

Syntax

/* Keyword values */
ruby-position: over;
ruby-position: under;
ruby-position: inter-character;

/* Global values */
ruby-position: inherit;
ruby-position: initial;
ruby-position: unset;

Values

over
Over exampleIs a keyword indicating that the ruby has to be placed over the main text for horizontal scripts and right to it for vertical scripts.
under
Under exampleIs a keyword indicating that the ruby has to be placed under the main text for horizontal scripts and left to it for vertical scripts.
inter-character
Is a keyword indicating that the ruby has to be placed between the different characters.

Formal syntax

over | under | inter-character

Examples

This HTML will render differently with each value of ruby-position:

<ruby>
  <rb>超電磁砲</rb>
  <rp>(</rp><rt>レールガン</rt><rp>)</rp>
</ruby>

Ruby positioned over the text

ruby {
    ruby-position:over;
}

This gives the following result:

Ruby positioned under the text

ruby {
    ruby-position:under;
}

This gives the following result:

Specifications

Specification Status Comment
CSS Ruby Layout Module Level 1
The definition of 'ruby-position' in that specification.
Working Draft Initial definition

Browser compatibility

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support No support  (Yes) 38 (38) No support [1] ?  No support [2]
inter-character No support  ? No support No support  ?  No support 
Feature Android Edge Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
Basic support No support  (Yes) 38.0 (38) No support [1] No support  No support [2]
inter-character No support  No support No support  No support  No support 

[1] Internet Explorer, since IE 9, supports a very old draft version, which defined inline (equivalent of having display: inline on the ruby), and above (synonym of the modern over)

[2] WebKit implements a non-standard, prefixed, version of ruby-position, -webkit-ruby-position: it has two properties: before and after (both equivalent, for ltr and rtl scripts to the standard over value used with ruby-align: start).

See also

Document Tags and Contributors

 Contributors to this page: erikadoyle, Sebastianz, fscholz, teoli
 Last updated by: erikadoyle,