<font>	A font variant (e.g. a blackletter form).
<noBreak>	A no-break version of a space or hyphen.
<initial>	An initial presentation form (Arabic).
<medial>	A medial presentation form (Arabic).
<final>	A final presentation form (Arabic).
<isolated>	An isolated presentation form (Arabic).
<circle>	An encircled form.
<super>	A superscript form.
<sub>	A subscript form.
<vertical>	A vertical layout presentation form.
<wide>	A wide (or zenkaku) compatibility character.
<narrow>	A narrow (or hankaku) compatibility character.
<small>	A small variant form (CNS compatibility).
<square>	A CJK squared font variant.
<fraction>	A vulgar fraction form.
<compat>	Otherwise unspecified compatibility character.