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What is HTML <!DOCTYPE> Declaration | HTML Tag Code
What is HTML <!DOCTYPE> Declaration

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>

Browser Support <!DOCTYPE> Declaration

Output should be:

Browser Support <!DOCTYPE> Declaration

Older HTML Documents

HTML 4.01:
index.html
Example: HTML
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

XHTML 1.1:
index.html
Example: HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
Reffered: https://www.w3schools.com/tags/tag_doctype.asp



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Browser Support <!DOCTYPE> Declaration
Older HTML Documents

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