Viewport
The viewport is the visible area of a web page that a user sees on their screen. It varies with devices - on a desktop, it's typically the size of the browser window, while on mobile devices, it's the screen size. The viewport concept is crucial in responsive web design, ensuring web content is displayed appropriately across different devices.
Products
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Technology & solutions
Digital.gov
Usability Evaluation focuses on how well users can learn and use a product to achieve their goals. It also refers to how satisfied users are with that process.
W3 Schools
Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more.
MDN Web Docs
A viewport represents a polygonal (normally rectangular) area in computer graphics that is currently being viewed. In web browser terms, it refers to the part of the document you're viewing which is currently visible in its window (or the screen, if the document is being viewed in full screen mode). Content outside the viewport is not visible onscreen until scrolled into view.