writing-mode

<attribute name="writing-mode" use="optional">
  <simpleType>
    <restriction base="string">
      <enumeration value="lr-tb"/>
      <enumeration value="rl-tb"/>
      <enumeration value="tb-rl"/>
      <enumeration value="lr"/>
      <enumeration value="rl"/>
      <enumeration value="tb"/>
      <enumeration value="inherit"/>
    </restriction>
  </simpleType>
</attribute>