To fix cross-browser compatibility issues, use feature detection libraries like Modernizr. Test your application on different browsers, and utilize CSS resets to minimize inconsistencies in styles.

Cross-browser compatibility is essential for ensuring that your web application provides a consistent experience across various browsers and devices. Issues can arise due to differences in how browsers interpret HTML, CSS, and JavaScript, making it crucial to adopt a proactive approach to testing and debugging. Start by utilizing feature detection libraries like Modernizr, which allow you to determine whether a specific feature is supported in a browser, helping you tailor your application to different environments. Additionally, regularly test your application on popular browsers, including Chrome, Firefox, Safari, and Edge, across different versions. This can help you catch inconsistencies and bugs that might not be apparent in your primary development environment. Utilize CSS resets or normalize stylesheets to minimize inconsistencies in default browser styles, creating a more uniform foundation for your CSS. When dealing with JavaScript, be aware of browser-specific behaviors and implement polyfills to support features that might not be available in older browsers. Consider using CSS Flexbox or Grid for layout purposes, as they offer more reliable behavior across modern browsers compared to older layout techniques. Implement responsive design principles to ensure that your application adapts gracefully to different screen sizes and orientations. Pay attention to accessibility standards to guarantee that all users can interact with your application, regardless of their chosen browser. Continuously monitor your application for compatibility issues, especially when adding new features or updates. By systematically addressing these areas, you can enhance cross-browser compatibility and provide a seamless experience for all users.