From various Palestinians I have heard different Holocaust versions: 1. The Holocaust never happened and is nothing but a Zionist lie. 2. Hitler made a mistake by killing not all the Jews. Thus, number 2 is actually an acceptance of the historical fact called Holocaust but, on the other hand, Muslims still admire Hitler and say that he was right but, unfortunately, missed killing all the Jews.
I have even heard Palestinians claiming that there never were any Jewish Temples in Jerusalem. One young Palestinians even denied that the Romans were ever in Jerusalem. From this you can see what Palestinians are being taught in their schools.