Google-backed AngularJS is a popular web application framework providing a client-side MVC architecture. It has been criticised in the past for its performance, particularly on mobile. As observed by Peter-Paul Koch, it’s odd that Google was pushing a mobile-challenged framework back in 2012 when it must have been obvious that Android was going to be pretty important to it as a company. Perhaps those who knew weren’t those who were pushing AngularJS.