Amazing! zero-width-space character can be used in css selectors!

https://en.wikipedia.org/wiki/Zero-width_space
https://emptycharacter.com/

The zero-width space character is encoded in Unicode as U+200B ZERO WIDTH SPACE (HTML ​ ·  ​).[6]

The TeX representation is \hskip0pt; the LaTeX representation is \hspace{0pt};[7] and the groff representation is \:.[8]

Its semantics and HTML implementation are similar to the soft hyphen, except that soft hyphens display a hyphen character at the point where the line is broken.

あいうえお​かきくけこ​さしすせそ