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"[iframes are] better than css, everything is too heavy now" is an incredibly deranged take that if i had to hear it so do you now
@mavica_again fortunately, golfshrine uses both things, to equally questionable ends. take that, random unknown internet takester 
disclaimer: i like iframes
if you don't know what web development is, iframes and css are not interchangeable or mutually exclusive or even do the same thing as this person suggests