XHTML 0 Strict
In XHTML 1.0 Strict document type definition (DTD), deprecated tags are not supported and the code must be written according to the XML Specification.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
HTML Doctypes
HTML Doctypes declared at the beginning of HTML documents, inform browsers about the document type and version, ensuring correct rendering. They aren’t HTML tags but provide essential information. The most common doctype is <!DOCTYPE html>, used for HTML5, ensuring modern web standards.
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