What defines a valid HTML document?

A valid HTML document is defined by its adherence to the specific syntax and structural rules established by the HTML standard. This includes correct nesting of tags, proper use of elements, and appropriate declaration of document types, among other requirements. When an HTML document conforms to these rules, it ensures that web browsers can properly interpret and render the content as intended, leading to a consistent experience across different platforms and devices.

While interactivity with JavaScript, the presence of specific tags like

, or linking to a CSS file are common practices in web development, they do not determine the validity of an HTML document. A valid document can exist without JavaScript functionality and may not necessarily include a

tag or any external styles. Hence, the correct answer emphasizes the importance of following HTML syntax as the fundamental requirement for document validity.

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