number-or-normal 

The number-or-normal values can be either a decimal number or the string "normal". This is used by the line-height and letter-spacing attributes.

Simple Type Information

Used By

Attributes letter-spacing/@letter-spacing, line-height/@line-height

Source 

<xs:simpleType name="number-or-normal">
  <xs:annotation>
    <xs:documentation>The number-or-normal values can be either a decimal number or the string "normal". This is used by the line-height and letter-spacing attributes.</xs:documentation>
  </xs:annotation>
  <xs:union memberTypes="xs:decimal">
    <xs:simpleType>
      <xs:restriction base="xs:token">
        <xs:enumeration value="normal"/>
      </xs:restriction>
    </xs:simpleType>
  </xs:union>
</xs:simpleType>