HTML !DOCTYPE Declaration


HTML !DOCTYPE Declaration

Definision and Usage

All HTML documents must start with a <!DOCTYPE> declaration.

The declaration is not an HTML tag. It is an “information” to the browser about what document type to expect.

In HTML 5, the declaration is simple:<!DOCTYPE html>

Older HTML Documents

In older documents (HTML 4 or XHTML), the declaration is more complicated because the declaration must refer to a DTD (Document Type Definition).

HTML 4.01:<!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.01 Transitional//EN” “”>

XHTML 1.1:<!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.1//EN” “”>

Tips and Notes

Tip: The <!DOCTYPE> declaration is NOT case sensitive.


<!DOCTYPE html>
<!DocType html>
<!Doctype html>
<!doctype html>

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