[thombat]

But for true feature creep you need to discard this "planning" (just tell yourself you're deftly avoiding a waterfall approach), and just focus on adding that "one last feature and then I'm done". And then iterate ad infinitum - for example what scale is the height, and for this are you considering just the viewport or the entire page? will you need an atmospheric model to account for lower density at altitude? if it is just the viewport then will scrolling have a consequence, like a sudden wind flurry? will marquee text induce laminar or turbulent flow?