CSS Box Model

A fundamental concept in CSS that describes how HTML elements are rendered as rectangular boxes with four distinct areas: content (the actual text or image), padding (space between content and border), border (the edge around the padding), and margin (space outside the border separating the element from neighbors). Understanding the box model is essential for web layout but challenging for screen reader users to learn because it describes visual spatial relationships. Accessibility educators often use tactile diagrams with concentric boxes and different textures to convey these nested spatial concepts to blind learners.