Version R20 and above has been tested with Classic, and  Dragonflight Retail.
You only need the latest version for all your XP reporting needs.

This data broker plugin provides an ASCII bar representing XP: ||||||||||||||||||||||||||||||

Click the ASCII bar to display config menu. You can change:
- the pattern used in the ASCII bar (default is |).
- the length / number of pattern repetitions (default is 30).
- colors for earned, rested and remaining xp.
- the thousand separator / the character used between groups of 3 digits for better reading or large numbers.

This is the updated original version that that was originally created by and credited to Aranath