Web elements are boxes defined by margin, border, padding, and content, and behave as inline (flow with text, no fixed width/height) or block (start on new lines, span full width). The article contrasts their key traits, when to use each, shows a responsive nav menu built with a block container and inline links, and notes inline-block for flexible layouts.
Block elements occupy full width, start on a new line and can contain other block or inline elements. Inline elements take up only needed space, don't start on a new line and can't contain block elements. Key differences include line breaks, width, content model with implications for layout, styling, accessibility in web app development.
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