Relies on browser's random number generator to choose from word list. A browser's RNG is of dubious quality at best; you're not likely to really get 44 bits of entropy from it.
Reminds me of this thing I did awhile back for some laughs:
<a href="http://dfcb.github.io/manly-man-passwords/" rel="nofollow">http://dfcb.github.io/manly-man-passwords/</a>