Instruction: Describe techniques to optimize and improve performance of CSS.
Context: This question tests the candidate's knowledge of performance optimization techniques in CSS, including minimizing reflows and repaints, and efficient selectors.
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To begin with, one fundamental approach I've relied on is minimizing CSS file size. This involves minifying the CSS files, which strips out all unnecessary characters, such as spaces, line breaks, and comments, without changing the functionality of the code. Utilizing tools like CSSNano or PurifyCSS, I've consistently managed to decrease the size of the stylesheet, leading to faster loading times.
Additionally, leveraging the concept of CSS concatenation has been instrumental. By combining multiple CSS files into one, the number of HTTP requests required to fetch resources from the server is reduced, thereby diminishing load times and enhancing the user experience. This is particularly effective in projects with a large number of small CSS files....