Which tag is used to represent the main content of an HTML document?

The tag used to represent the main content of an HTML document is the <main> tag. This tag is specifically designed to identify the primary content area of a webpage. It indicates that the content contained within this tag is directly related to or expands upon the central topic of the document.

Utilizing the <main> tag enhances the semantic structure of the HTML and ensures better accessibility. Assistive technologies, such as screen readers, can identify and navigate to the main content more efficiently when this tag is used.

In contrast, the <content> tag does not exist in HTML specifications and therefore cannot be utilized to represent any content. The <article> tag is intended to encapsulate independent, self-contained compositions that could potentially be distributed and reused elsewhere, but it does not specifically indicate the main content of a document. The <section> tag serves to define thematic grouping within a document but is not limited to the primary content, as it can be used for various purposes throughout the HTML structure.