Viewport
The visible area of a web page in the browser window or on the device screen.
Definition
The viewport is the part of the page currently visible to the user. Its width determines which responsive layout is shown. In DevTools you can change the viewport size to simulate different devices.
In practice
At a viewport width of 768 pixels the product grid should show two columns, and at 1280 pixels it should show four.
Learn it in context
Lessons that use this term.