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Doctype - Glossary | MDN

In HTML, the doctype is the required <!doctype html> preamble found at the top of all documents. Its sole purpose is to prevent a browser from switching into so-called "quirks mode" when rendering a document; that is, the <!doctype html> doctype ensures that the browser makes a best-effort attempt at following the relevant specifications, rather than using a different rendering mode that is incompatible with some specifications.



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Doctype - Glossary | MDN

https://msdn.microsoft.com/en-us/library/ms535242(VS.85).aspx

In HTML, the doctype is the required <!doctype html> preamble found at the top of all documents. Its sole purpose is to prevent a browser from switching into so-called "quirks mode" when rendering a document; that is, the <!doctype html> doctype ensures that the browser makes a best-effort attempt at following the relevant specifications, rather than using a different rendering mode that is incompatible with some specifications.



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https://msdn.microsoft.com/en-us/library/ms535242(VS.85).aspx

Doctype - Glossary | MDN

In HTML, the doctype is the required <!doctype html> preamble found at the top of all documents. Its sole purpose is to prevent a browser from switching into so-called "quirks mode" when rendering a document; that is, the <!doctype html> doctype ensures that the browser makes a best-effort attempt at following the relevant specifications, rather than using a different rendering mode that is incompatible with some specifications.

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      In HTML, the doctype is the required <!doctype html> preamble found at the top of all documents. Its sole purpose is to prevent a browser from switching into so-called "quirks mode" when rendering a document; that is, the <!doctype html> doctype ensures that the browser makes a best-effort attempt at following the relevant specifications, rather than using a different rendering mode that is incompatible with some specifications.
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