How does Netflix.com keep their sections so perfectly fluid on browser resize? And how is the font changing based on viewport width?

Im looking at their code and I cant figure it out. Resize it around and everything changes proportionately perfectly. Are they using some JavaScript to achieve this? Pretty impressive.

Epic visual tool

Epson 5030UB 2D/3D 1080p 3LCD Projector Submitted November 05, 2015 at 07:01AM by Mike http://ift.tt/1Rxi91h