Instruction: Describe best practices and considerations for structuring an HTML document to support multiple languages.
Context: This question assesses the candidate's knowledge of internationalization and localization practices in web development, focusing on the implementation of multilingual support in HTML.
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First and foremost, the backbone of creating a multilingual website lies in the thoughtful structuring of your HTML document. It's pivotal to use the lang attribute in the <html> tag to declare the primary language of the document. This not only aids search engines in categorizing content by language but also helps screen readers provide a more accurate experience for users with accessibility needs.
For instance, setting <html lang="en"> for an English page and <html lang="fr"> for a French page....