Cross-Browser checking, is a process most website developers go through.
It is the process of ensuring a website works correctly, or as best as possible on a number of different browsers.
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This is to ensure customers visiting the site, can experience your website, and not run into issues and leave it for a competitors website which works for them. (link: https://www.superdream.co.uk/cross-browser/#more-4320 text: (more…))