If this option is selected, the character
entities that have a Unicode character are replaced by
that character, and other character entities are converted
to standalone tags.
If this option is
not selected, the characters that are listed here
are represented by the listed tags and other character entities are
converted to standalone tags.
<\[> thin space
<\{> hair space
<\z> zero width space
<\8> figure space
<\p> punctuation space
<\_> em dash
<\!-> non-breaking hyphen
<\!s> non-breaking space
<\m> em space
<\e> en space
<\j> word joiner
<\5> three-per-em space
<\$> four-per-em space
<\^> six-per-em space