What is the purpose of the <!DOCTYPE html> declaration?

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The purpose of the declaration is to define the document type and version of HTML being used. This declaration informs the web browser which version of HTML the document is written in, so the browser can render the content correctly.

Using at the beginning of an HTML document signifies that the document conforms to HTML5 standards. This is crucial for ensuring compatibility across different web browsers and helps prevent rendering issues that can arise when the browser is unsure of how to interpret the HTML code.

The other options relate to different aspects of HTML documents but do not pertain to the specific role of the doctype declaration. For instance, specifying the character set is done through the tag, linking to external stylesheets is accomplished through the tag, and marking the beginning of an HTML document is a broader concept that encompasses more than just the doctype declaration.

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