Print.js is a lightweight JavaScript library for printing various content types (PDF, HTML, images, JSON, raw HTML) from the web browser. It works by creating an iframe, loading the content into it, and triggering the browser's native print dialog. The library handles browser-specific quirks (e.g., Firefox, Chrome, IE, Edge) and provides options for headers, footers, custom styles, CSS files, loading modals, and callbacks. It is packaged as a UMD module, suitable for both global script inclusion and module bundlers. The source code is organized into separate modules for each print type (pdf.js, html.js, image.js, json.js, raw-html.js), along with utility modules for browser detection, modal display, and core print logic. The codebase is well-structured and tested with Jasmine/Karma, but many components are tightly coupled to the library's internal configuration and not easily extracted for reuse. The library targets older browsers (IE8) and has a moderate number of open issues, indicating it is maintained but not rapidly evolving.