Margin collapsing is a peculiar CSS behavior that occurs when the margins of adjacent elements interact in a way that leads to a combined margin space, rather than the sum of individual margins. In other words, the margins collapse into one another. This behavior is not a bug, but rather a defined feature in the CSS specification.
The :has selector in CSS has taken the CSS community by storm, offering the power to accomplish complex tasks with ease. In this post, I will provide a comprehensive overview of how the :has selector works, how to use it, and what it replaces.