There are many tools for showing you screenshots of websites in different browsers to help with testing. But a screenshot is lacking in so many ways: no clicking, no hovering, no typing, no resizing, no testing JavaScript or other interactive elements, nothing. Real cross-browser testing means opening those websites in real live browsers. Some people use virtual machines to do that testing, but that can be resource intensive in more ways than one.
BrowserStack is the holy grail of cross-browser …
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