Vodafone interview question

Can you explain the difference between margin and padding in CSS? How would you use each property in a front-end development project? How do you optimize website performance and loading times? Can you mention some techniques or tools you would use to achieve this? Describe a situation where you had to troubleshoot a cross-browser compatibility issue. How did you identify and resolve the problem? Have you worked with any CSS preprocessors like Sass or Less? What are the benefits of using a preprocessor, and how have you utilized it in your previous projects? Can you explain the concept of responsive web design and how you ensure that a website is mobile-friendly? What techniques or frameworks do you use to create responsive layouts?