What does the doctype declaration indicate to a web browser?

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The doctype declaration is a crucial element in HTML that informs the web browser about the version of HTML being used in the document. By specifying the doctype, the browser can render the content correctly, applying the appropriate rules and rendering techniques for that particular version of HTML. This helps ensure that the webpage displays consistently across different browsers and versions.

For example, the declaration <!DOCTYPE html> at the top of an HTML5 document tells the browser that it is dealing with HTML5, which includes specific features and behaviors distinct to this version. If the doctype were set incorrectly or omitted entirely, it could lead to rendering issues, as the browser might fall back to a compatibility mode or a different parsing mode, potentially altering how the webpage appears.

The other options do not accurately describe the purpose of the doctype declaration. The structure of CSS, the server's IP address, and the page's title are all unrelated to the function of the doctype declaration. The doctype serves specifically to identify the HTML version, making option B the correct choice.

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