But having such a font does not necessarily mean that your particular script can be displayed correctly. Indic and South-East Asian scripts have complex requirements for display. The same is true for Arabic script. A font for any of these scripts must have many more glyphs than the number of Unicode characters for that script. I ll take about missing characters later.
Libraries have certain special needs.
Fonts and software for the correct display of base character and non-spacing marks is needed. EACC includes a number of distinct characters which have been unified under the IRG rules for unified Han. Therefore, some supplementary font images are needed for the display of these ideographs. Glyphs for the presentation of Arabic script are also needed.