Cross-compatibility means your website is easy to use across different devices and browsers.
There is more to cross-compatibility then just making your website responsive. Understanding what devices your users are using and how they are using your website is just as important.
Before you embark on this journey, make sure you have a full understanding of your audience and what they need from your website.
Have you ever visited a website on your mobile phone and come across a spot in an article that you can't scroll past for some reason? Maybe you have been on your laptop and opened a website where everything looks bigger than it should be. You may have even been to a website where everything just looks off.
These are examples of poor cross-compatibility.
Poor cross-compatibility can lead to a frustrating user experience. Ultimately, the poor user experience will lead to users leaving your website and never coming back.