Applications and sites in different browsers can behave differently. This is due to the fact that any of the browsers has its own add-ons, plugins, as well as differences in the desktop and mobile versions. Cross-browser testing is designed to smooth out these differences, making development more or less universal.

Comparium is a web service that takes screenshots of your site in different operating systems and browsers. This is a very convenient website testing tool to check your site in many browsers at once.