The term cross-browser is usually used in a couple different ways. Here are some phases this term is often found in:
- cross-browser testing
- cross-browser issues
- cross-browser compatibility
In general, cross-browser means all the major browsers collectively. So, cross-browser testing means to test across all the major browsers. Cross-browser issues means that there are issues across the different browsers. And cross-browser compatibility means having your code be compatible across all the major browsers.