Add to Homescreen call out

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 later, Chrome for Android, and planned Windows Phone support. Developers integrate it by adding the CSS and JavaScript files to a page and calling the main function early in the document. The repository is archived and read-only, so it is mainly useful for legacy projects, historical reference, or lightweight custom implementations.