wtf is popup-polyfill?

popup-polyfill is a small tool that lets web developers use a proposed new HTML feature called the popUp attribute before all web browsers officially support it. The practical benefit is that developers can add popup boxes, tooltips, or overlays to a website using simple HTML tags instead of writing complex JavaScript to manage their display and positioning. At a high level, it works by adding a bit of behind-the-scenes code to a webpage. Once included, it automatically teaches the browser how to understand the new popUp attribute and its related showPopUp and hidePopUp commands. It also comes with a basic stylesheet that provides sensible default visual rules so the popups look and behave correctly right out of the box. This is meant for web developers and designers who want to build cleaner, more accessible interfaces without waiting years for browser makers to finish drafting and implementing new web standards. For example, if someone is building a custom dropdown menu, a hover tooltip, or a small settings dialog, they could use this tool to handle the open-and-close behavior natively and simply. Once all browsers eventually support the feature on their own, the polyfill becomes unnecessary and can simply be removed. The project is notably straightforward to use. It is designed to run automatically once it is included on a page, so developers do not need to manually configure it for every single popup element. It can be downloaded directly and added to a project, installed through a package manager, or quickly linked through a content delivery network for testing. However, the documentation specifically advises against relying on a CDN for live production websites due to performance and reliability concerns.