The advanced guide to the CSS :has() selector

The CSS :has() pseudo-class is a level 4 selector now widely supported across major browsers, enabling developers to perform tasks previously reliant on JavaScript. This relational pseudo-class allows the selection and styling of elements based on their child elements, offering functionality akin to the jQuery has() method. The article discusses the necessity of the :has() selector, its applications ranging from basic to advanced use cases, and the improved browser compatibility, highlighting its role in streamlining tasks like selecting parents from children and checking for multiple children. It also covers the performance and accessibility enhancements it brings to web development, offering best practices to mitigate potential performance issues associated with its use. Additionally, the text explains the progress in browser support and provides methods to ensure compatibility, such as using the @supports CSS rule and the Support API in JavaScript, while emphasizing the selector's utility in modern frontend frameworks like React and Vue.