1. css property: display: ruby

  2. css property: display: ruby-base

  3. css property: display: ruby-base-container

  4. css property: display: ruby-text

  5. css property: display: ruby-text-container

  6. css property: ruby-align

  7. css property: ruby-position

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

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