ruby-align

This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for the proper prefixes to use 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 spec changes.

Summary

The ruby-align CSS property defines the distribution of the different ruby elements over the base.

Initial value	`space-around`
Applies to	ruby bases, ruby annotations, ruby base containers, ruby annotation containers
Inherited	yes
Media	visual
Computed value	as specified
Animatable	no
Canonical order	the unique non-ambiguous order defined by the formal grammar

Syntax

/* Keyword values */
ruby-align: start;
ruby-align: center;
ruby-align: space-between;
ruby-align: space-around;

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

Values

start: Is a keyword indicating that the ruby will be aligned with the start of the base text.
center: Is a keyword indicating that the ruby will be aligned at the middle of the base text
space-between: Is a keyword indicating that the extra space will be distributed between the elements of the ruby.
space-around: Is a keyword indicating that the extra space will be distributed between the elements of the ruby, and around it.

Formal syntax

start | center | space-between | space-around

Examples

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

<ruby>
  <rb>This is a long text to check</rb>
  <rp>（</rp><rt>short ruby</rt><rp>）</rp>
</ruby>

Ruby aligned at the start of the base text

<ruby>
  <rb>This is a long text to check</rb>
  <rp>（</rp><rt>short ruby</rt><rp>）</rp>
</ruby>

ruby {
  ruby-align:start;
}

This gives the following result:

Ruby aligned at the center of the base text

<ruby>
  <rb>This is a long text to check</rb>
  <rp>（</rp><rt>short ruby</rt><rp>）</rp>
</ruby>

ruby {
  ruby-align:center;
}

This gives the following result:

Extra space distributed between ruby elements

<ruby>
  <rb>This is a long text to check</rb>
  <rp>（</rp><rt>short ruby</rt><rp>）</rp>
</ruby>

ruby {
  ruby-align:space-between;
}

This gives the following result:

Extra space distributed between and around ruby elements

<ruby>
  <rb>This is a long text to check</rb>
  <rp>（</rp><rt>short ruby</rt><rp>）</rp>
</ruby>

ruby {
  ruby-align:space-around;
}

This gives the following result:

Specifications

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

Feature	Chrome	Firefox (Gecko)	Internet Explorer	Opera	Safari (WebKit)
Basic support	Not supported	38 (38)	Not supported^[1]	Not supported	Not supported

Feature	Android	Firefox Mobile (Gecko)	IE Phone	Opera Mobile	Safari Mobile
Basic support	Not supported	38.0 (38)	Not supported^[1]	Not supported	Not supported

[1] Since version 9 Internet Explorer implements an early draft of CSS Ruby where ruby-align had the following values: auto, left, center, right, distribute-letter, distribute-space, and line-edge. Here is a rough conversion table:

IE syntax	Standard syntax
`auto`	Don't use `ruby-align`
`left`	Use `start` (in ltr scripts)
`center`	`center`
`right`	Use `start` (in rtl scripts)
`distribute-letter`	No direct equivalent, use `space-between` or `space-around`
`distribute-space`	`space-around`
`line-edge`	No direct equivalent.

ruby-align

Summary

Syntax

Values

Formal syntax

Examples

Ruby aligned at the start of the base text

Ruby aligned at the center of the base text

Extra space distributed between ruby elements

Extra space distributed between and around ruby elements

Specifications

Browser compatibility

See also

Document Tags and Contributors