Original Post from Shane Corning: #Webdesign , #ResponsiveDesign . #TestingTools , #QualityControl for those who cannot afford to buy every single after-market device available for consumers. :) ... #Ghetto . ;) I turned Javascript to ON for this site, within #NoScript , and it's working fine. I suggest doing the same. About responsivepx. Enter the url to your site - local or online: both work - and use the controls to adjust the width and height of your viewport to find exact breakpoint widths in pixels. Then use that information in your media queries to create a responsive design. - mjc