nxml-char-ref-extra-display

nxml-char-ref-extra-display is a variable defined in `nxml-mode.el'.
Its value is

t

• Automatically becomes buffer-local when set.

Documentation:
Non-nil means display extra information for character references.
The extra information consists of a tooltip with the character name
and, if `nxml-char-ref-display-glyph-flag' is non-nil, a glyph
corresponding to the referenced character following the character
reference.