Is this why IE6 doesn’t support PNG24?

So Mosaic‘s source code has just been released on GitHub, and a sharp eye at Reddit has already spotted this gem (keep in mind that IE is originally derived from Mosaic).

Assuming that IE was actually derived from this code base, may I present the reason we had to work around PNG24 for almost a decade:

/* its #if'ed out for now cause I don't have anything to
   test it with */