Since the advent of mobile, web sites are turning more and more into “apps”. Concepts that make sense for a locally running application are transferred to the web. One of these is the recent addition of “progress bars” to some of Google’s websites that show the loading state of the page.
NProgress is a jQuery plugin that shows an interactive progress bar on the top of your page, inspired by the one on YouTube. It consists of a global object – NProgress which holds a number of methods that you can call to advance the progress bar.