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Here is a list of characters I see squares with instead of the proper characters. The list is extracted from here:

CJK Unified Ideographs Extension B

𠀀 𠀁 𠀂 𠀃 𠀄 𠀅 𠀆 𠀇 𠀈 𠀉 𠀊 𠀋 𠀌 𠀍 𠀎 𠀏 𠀐 𠀑 𠀒 𠀓 𠀔 𠀕 𠀖 𠀗 𠀘 𠀙 𠀚 𠀛 𠀜 𠀝 𠀞 𠀟 𠀠 𠀡 𠀢 𠀣 𠀤 𠀥 𠀦 𠀧 𠀨 𠀩 𠀪 𠀫 𠀬 𠀭 𠀮 𠀯 𠀰 𠀱 𠀲 𠀳 𠀴 𠀵 𠀶 𠀷 𠀸 𠀹 𠀺 𠀻 𠀼 𠀽 𠀾 𠀿 𠁀 𠁁 𠁂 𠁃 𠁄 𠁅 𠁆 𠁇 𠁈 𠁉 𠁊 𠁋 𠁌 𠁍 𠁎 𠁏 𠁐 𠁑 𠁒 𠁓 𠁔 𠁕 𠁖 𠁗 𠁘 𠁙 𠁚 𠁛 𠁜 𠁝 𠁞 𠁟 𠁠 𠁡 𠁢 𠁣 𠁤 𠁥 𠁦 𠁧 𠁨 𠁩 𠁪 𠁫 𠁬 𠁭 𠁮 𠁯 𠁰 𠁱 𠁲 𠁳 𠁴 𠁵 𠁶 𠁷 𠁸 𠁹 𠁺 𠁻 𠁼 𠁽 𠁾 𠁿 ...

Screenshot

There is a large amount of characters I can't see. I'm currently using the latest version of Chrome on Debian 9.8 and I have installed Bitstream Vera and Twemoji Color Font to see if it solved the problem (it doesn't).

How do I increase the amount of supported Unicode characters for my display?


I should also add that it is currently impossible for me to properly visualize Zalgo texts due to this same problem. Instead, floating squares are displayed around the emojis and the text.

Example texts (screenshot):

 

T̸̴̺̺͇̝̬̫͔̙͠H͚I̴̧͏̬̞̖͕S̭͜ ̴̲ͅI̷̶̯͖̤̥̻͝Ş͕͍̭̣̟̼́̕ ͏̗̥̰̗̺̩̦ͅE̶̘̲̬͖̜̟͙̭̖X̛͕̘͈̥͙̪͎T̶͚̕R҉̻͍̜È̙͎̙̟̥̕ͅM̹̲̘͇̤̦͜͡Ę̣̼͈͈̳͝ͅL̗͔͝Y̘̭͉̳ ̗̞͎͘D̯̦̺̯̟̟̥̕͜ͅA̷҉̸̖̥͖͇͖N̷̵̖̱̣̘͎G̻͙͚̳̰̱͓̱̫͘E͏̠͉̻̰̪̲̰͖̭R҉͏͍̼̗̥ͅO̞͖̮̳͓U͍̣̫̤̼͟S̭̘ ̠̯̰͇̞Ţ͇̯̙O̷͚̱͕̦̪̪͉̺͞ ͏̨͉̫̬̠̞̘̩͍ͅO̙̜̫̯̘U̸̩̰̦̮̜̞R̮̤̝̜͉̖̘̞̞ ̛͉̠̤̟̼̭͉͞M̝͈͕͍͖͇͘͠Ò̸͈̝N͏͏̥̦̰̞̖ͅÒ̬̮͔̤̥͕̻ͅP̫̝̟̖͓̙̟͜Ọ̷̭͠Ļ̸̴̜͎Y̷̴̜͖͈̹̫͈̞̬ ̡̪͕̜͙  

 

 

 

 

H̦̲͖̻̣͓͕̹͆͛̅͂̀́ë̱͕͎̞͈̪̥̖̙́͛̉̿ͨḹ͛̎̑ͩͬ̏ͭͩl̠̭̣͍̋͒̀͊ͧ̋ͪ̐ͨo̝̦͇̼̭̞̹̅̾͆ͣͯͪ͂̐ ͚̘ͯͅl̖̰ͭͤ̆̆̆̽i̪̤̞̬͔̭͓͗̿̓̃͌̌͊t̮̤̱̬̘͎̃̆ͧ̿ͧt̩̪̘̘ͣ͂ͦľ̬̬͈̼̌͌ͪ̄ͭe̺̙̜͚͇̙̠̲̗ͪ̔͑͛̀̅ͧ͊ ͈͉͂͑̂ṭ͈̤̥͋̇̇̆͗ͫ̏h͉̬̣̜̳͍͍̗̿̇̈̏ͨ̔i̘̪̯̞̳̜ͥ͋ͅn̼̙̫̮̼̼̗̙ͩͩ͗̋̓ͅg̯͎̝̺̩ͣ̐̎ͩ͐ͅ.̣͓̟͉̖̟͖̌ͨ̏ͅ

4

Let's clarify first:

There is no way to increase the amount of supported Unicode characters in Debian as a default Debian supports all unicode characters (code points).

What you are missing is one (or several) fonts that have glyphs (images) for the required characters (code points).

One (free) font that covers a huge amount of glyphs of HAN ideograms is BabelStone Han

Installing such ttf font should increase the coverage of the whole HAN range.

But CJK Unified Ideographs Extension B is a Unicode block containing rare and historic CJK ideographs for Chinese, Japanese, Korean, and Vietnamese.

Given that those ideographs are rare and historic it is not surprissing that the font given above only covers 15.9% ( 6,879 / 42,711 ) of that range. Even installing the full list of 49 fonts (some expensive) listed in here the coverage will only get up to 47.21% ( 20,162 / 42,711 ) of that range.

So: don't expect Debian (nor anyone else) to cover the whole range.

There are some other fonts that contain glyphs in that range as listed in this page.


For zalgo text (using many combining characters, also known as combining marks):

The simplest way is to download and install a sufficiently large font, such as Symbola

| improve this answer | |
  • 1
    Thank you. I installed two fonts that solved the problem partially. I will revisit this answer if I have more problems in the future that need other fonts. I installed fonts-croscore to be able to display the Zalgo, and I installed fonts-hanazono to be able to see the hanzi characters. – Besto May 1 '19 at 11:27

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