Grow

Inktober day 14 prompt: Overgrown

Demo: https://www.dwitter.net/d/16102

with(x)for(t?T=99:fillText("Grow",50,1e3,1800,font="73em impact");T--;fillRect(X=T*21+9*S(t*99),Y=1080-t*499+q%9,19*(!!getImageData(X+9,Y,1,1).data[3]|Y>1e3),19))fillStyle=R(0,255*S(q=(t+9)**T))