The doctype declaration

DOCTYPE is a special tag which is declared in the very beginning of a web page before <html> tag. It sends an instruction to the web browser about the version of HTML. <!DOCTYPE> is not a HTML tag and most of the modern browsers support this tag declaration. As HTML5 is not based on SGML, so no DTD reference is required in <!DOCTYPE> declaration. This tag is also very useful for SEO.

An example of typical HTML5 doctype tag declaration is shown below:

<!DOCTYPE html>

For example, we have given below a small HTML5 code snippet for creating a simple web page with doctype declaration:

<!DOCTYPE html>
    <title>HTML5 page title</title>
    HTML5 page content

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