In this chapter, we learned what performance is and what the consequences are if a website has poor performance. Then, we explored what factors could cause our web page to load slowly. In this chapter, we also learned how we can measure the performance of a website with the help of various tools available online, and covered the steps we can take to improve the performance of our websites. We then covered some of the best practices we can follow with relevance to the performance of the website.

We then moved on to explore the importance of maintaining cross-browser compatibility and considered some of the solutions that are available to deal with cross-browser issues. Then, we covered the challenges that are present in testing cross-browser compatibility across a wide combination of available browsers and devices. Apart from that, we discovered how to tackle this problem and devise a strategy to get the maximum output. Finally, we saw some of the tools that are available online to test the compatibility of our website across various browser-device combinations. We have now reached the end of our journey through the essentials of creating responsive sites. We hope you enjoyed reading this book as much as we have writing it, and that it helps you make a start into the world of responsive design using little more than plain HTML and CSS.