Settling program similarity issues in JavaScript can be testing, however here are a few general procedures to help: 1. **Feature Detection**: Rather than program discovery, use highlight identification to check in the event that a specific component or Programming interface is accessible in the client\'s program. Libraries like Modernizr can help with this. 2. **Polyfills**: Use polyfills to give missing usefulness. Polyfills are JavaScript code that executes a component on the off chance that it\'s not upheld by the program. 3. **Vendor Prefixes**: A few CSS properties and JavaScript APIs might require merchant prefixes. Use CSS preprocessors like Autoprefixer to naturally add the fundamental prefixes. 4. **Transpilers**: Utilize a JavaScript transpiler like Babel to compose current ES6/ES7 code and have it incorporated into more established forms of JavaScript that are upheld by most programs. 5. **Testing**: Routinely test your code in various programs and program adaptations to catch and address similarity issues early. Apparatuses like BrowserStack or crossprogram testing administrations can be useful. 6. **Use Cross-Program Libraries**: Use libraries like jQuery that theoretical away many cross-program issues, or present day structures like Respond, Precise, or Vue.js, which handle a significant part of the similarity for you. 7. **Avoid Program Explicit Features**: Limit the utilization of program explicit elements or censured APIs. Stick to normalized highlights whenever the situation allows. 8. **Stay Informed**: Stay up with the latest with program updates and changes in JavaScript norms to likewise change your code. 9. **Progressive Enhancement**: Begin with a fundamental variant of your site or application that works in all programs and afterward improve it for additional cutting edge programs. 10. **User-Specialist String**: While it\'s not suggested, at times, you might have to check the client specialist string to apply explicit code for a specific program. Be that as it may, this approach isn\'t great and ought to be utilized if all else fails. Recollect that the particular way to deal with settling similarity issues might differ relying upon your task and the issues you experience. It\'s fundamental to be versatile and focus on coding rehearses that advance cross-program similarity all along.