Web technology advancements have significantly narrowed the gap between web and native applications, with features like installation, push notifications, and offline functionality now available in web apps through Progressive Web Applications (PWAs). This text outlines a step-by-step guide to building a simple PWA and setting up a Continuous Integration (CI) pipeline using CircleCI for automated testing. It begins with the creation of a basic application structure, including HTML, CSS, and JavaScript files, and the implementation of a service worker to enable offline capabilities by caching files. A manifest file is added to support the Add to Home Screen feature, and testing is set up using tools like JSDOM, Jest, and the DOM Testing Library. The guide culminates with configuring a CircleCI pipeline, detailing how to push the project to a GitHub repository, set up the repository on CircleCI, and automate the testing process, ensuring that the application is continuously tested with every code update.