What technique is commonly used to test and improve cross-browser compatibility?

The technique of thorough testing across various browsers is integral to ensuring cross-browser compatibility. This process involves checking how a web application performs and appears in different browser environments (like Chrome, Firefox, Safari, and Edge) and on various devices. Each browser may interpret HTML, CSS, and JavaScript differently, leading to discrepancies in layout, functionality, or user experience.

By conducting extensive testing, developers can identify specific issues that may arise in one browser but not in others. This allows them to make necessary adjustments, whether that involves adding specific CSS rules, modifying JavaScript for compatibility, or rewriting parts of the HTML structure. Ultimately, this approach ensures a consistent experience for all users, regardless of the browser they are using.

In contrast, utilizing CSS frameworks alone may not address all compatibility issues, as not all frameworks are universally supported across browsers. Integrating multiple JavaScript libraries might introduce conflicts or depend on features not available in all browsers. Lastly, relying solely on a single coding language does not inherently resolve browser compatibility problems, as how code is interpreted can vary greatly even in a single language.