Generally, power chords contain the 1st and 5th(tho they can be other intervals). these 5power chords do work well with a heavyily driven sound. They also can be either major or minor, as they contain no 3rd, and the 3rd determines wether the chord is major or minor.
as for that link, no it didnt work for me either.

I am also pretty sure you are refferring to barre chords.