There seem to be a problem in BBCODE that size/width of web font on screen changes just a little when [color] tags are used in realtime to change color of just one letter of existing text on screen from white to red
e.g.
"[color=white]"&left(Text,1)&"[color=red]"&right(Text,(len(Text)-1))
Problem occurs with most fonts e.g. this font:
fonts.google.com/specimen/Fira+Sans
Problem is not in my code, as this same problem does not appear with all fonts e.g. "Ahkio light"
Any ideas how to fix this issue?