Can an HTML document validate without a DOCTYPE declaration?

  • No, because the validator won't know the HTML version. 
  • No, unless it's an older version of HTML. 
  • Yes, but only if it's an XML document. 
  • Yes, if it uses default HTML tags. 
A DOCTYPE declaration is essential for an HTML document to validate correctly. Without it, validation tools won't know which version of HTML or XHTML the document is using. Consequently, the document cannot be checked against a specific set of rules or standards. While a document might appear fine in some browsers even without a DOCTYPE, it's essential for ensuring the document adheres to web standards and is displayed consistently across all browsers. 
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