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What is Document Object Model (DOM)?

“DOM is a platform and language-neutral interface” w3, in another phrase, “DOM is an application programming interface (API) for valid HTML and well-formed XML documents” w3. The primary goal of DOM is to describe document hierarchy structure as node objects.

DOM tree structure starts with a document which is the parent element of all elements, then first child HTML is coming, the HTML is a parent of HEAD and BODY. By using JavaScript, we can access the first h1 tag in the DOM.

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