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The Document Object Model (DOM) is a programming interface that represents an HTML document as a tree structure where each element, attribute, and piece of text becomes a node. JavaScript can interact with this tree to dynamically read, modify, add, or delete elements on a webpage, enabling interactive and dynamic user experiences without reloading the page.
Semantic HTML means using HTML elements that clearly describe their meaning and purpose in the document structure. Instead of generic div and span elements everywhere, semantic tags like header, nav, main, article, section, aside, and footer communicate the role of content to browsers, search engines, and assistive technologies like screen readers.
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