The Height Enigma * Josh W. Comeau
Briefly

The article explores the perplexing nature of CSS height and width, particularly how their calculations differ. While block-level elements automatically expand to occupy available width, height adapts based on the content it contains, often causing confusion for beginners. The author emphasizes that once one learns about the underlying mechanisms of CSS, like how elements interact with their parent and child elements, these seemingly random issues begin to make sense. The post aims to provide insights not only for novices but also for experienced developers, helping them understand common pitfalls and how to troubleshoot effectively.
In CSS, width and height are fundamentally different. By default, they're calculated in totally opposite ways, leading to common confusion for beginners.
Block-level elements will expand to take up all available width, but for height, they shrinkwrap around their children, leading to unexpected behavior.
Read at Joshwcomeau
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