Understanding viewports

A viewport is the visible area of a user's web page. Therefore, the term viewport is used to measure the rectangular viewing region on a user's device. When computers were first invented, there were only a few available viewports, though that has significantly increased due to more devices being created. At the time of writing, new viewports are being created by devices such as folding phones or flipping screens, and smart televisions with different dimensions, so it is up to developers to ensure that their applications are compatible with the user's devices. With different viewports, new challenges arise in terms of making applications compatible with such viewports, and this is even a greater nightmare for testers as it is practically not possible to test an application through every available viewport.

In this section, we will explore the importance of viewports, how to approach testing in different viewports, and the role of viewports in...