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HTML: DOCTYPE declaration

The DOCTYPE declaration of a HTML document defines the defines the document type of a webpage wich in turn controls the layout mode in which a web browser renders the document.
In order to render a document in full standard mode, the following DOCTYPE declaration needs to be put at the start of a HTML document: 
<!DOCTYPE html>
If there is anything before the <!DOCTYPE html> declaration, the document will be assumed to be in quirks mode.

See also

HTML elements

Links

MDN: Quirks Mode and Standards Mode

Index

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