Thanks for the excellent answer. However, looking at your screen shot I got jealous because my browser doesn’ t the little text window "mark this answer…
May I propose to add this information with the picture into the FAQ · How does karma system work?. I read there, but did not find the explanations for the buttons. (Or I might need glasses!!!)
Also thanks to you. However, the extended tool tips in LibO don’t work here. I tried it. I also had a look at my browser (Firefox) but didn’t find a possibility to display tool tips.