1. Ruby annotation

    Method of adding pronunciation or other annotations using ruby elements (primarily used in East Asian typography).

  2. css property: display: `ruby`, `ruby-base`, `ruby-base-container`, `ruby-text`, and `ruby-text-container`

  3. css property: ruby-align

  4. css property: ruby-position

  5. css property: ruby-position: `alternate`

  6. css property: ruby-position: `inter-character`