Add to Homescreen call out is a JavaScript and CSS utility that displays a mobile prompt encouraging users to add a web app to their device home screen. It was built for mobile web apps that wanted a clearer install-style callout before modern progressive web app behavior became more standardized. The script automatically shows an overlay message on supported mobile devices, making the add-to-home-screen action easier for users to notice. It was designed for compatibility with iOS 6 and...