Re: Unicode confusables and reordering characters considered harmful, a simple solution

[Gregory Heytings]

> > Anyway, if one wants to be able to highlight certain characters on 
> > display, one could also use highlight-regexp, I think.
>
> Or markchars.el with markchars-what customized to markchars-confusables.

Neither would work AFAICS, because these characters are glyphless. 
Highlighting a glyphless character will not make it more visible.