the monospace 9 might appear as a box on some browsers
the fonts that support the mono space 9 are listed here: Cambria Math Code2001 DejaVu Sans Mono EversonMono EversonMono-Bold EversonMono-BoldOblique EversonMono-Oblique FreeSerif LastResort PragmataPro Liga Regular PragmataPro-Bold PragmataPro-BoldItalic PragmataPro-Italic PragmataProMono PragmataProMono-Bold PragmataProMono-BoldItalic PragmataProMono-Italic Quivira STIX Two Math Symbola Unifont Upper
