Probably doing something dumb...but when I enter the console in Chrome and try resizing the screen, I don't see the pixel values anymore. What's up?
Are you using Chrome version 49.0.2623.87? If so, this is a known bug and has been mark as fixed. The feature will be available in upcoming version 50 according to this discussion. For the time being, maybe you can install an extension or alternatively use the developer version where this issue doesn't exist.