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HTML <!DOCTYPE> Tutorial

The <!DOCTYPE> declaration is used to inform the web browser about the HTML version being used in the document. It is not an HTML tag, but rather an instruction to the web browser on how to interpret the document.

Usage

The <!DOCTYPE> declaration is placed at the very beginning of an HTML document, before the <html> tag. It is written as follows:

<!DOCTYPE html>

This declaration tells the web browser that the document is written in HTML5.

Attributes

Below are the main attributes of the <!DOCTYPE> declaration:

Attribute Description
html Specifies the document type version (e.g. HTML5)
public Specifies the public identifier of the document type
system Specifies the system identifier of the document type

When specifying the doctype, the html attribute is mandatory, while the public and system attributes are optional.

Examples

Below is an example of a simple HTML document with the <!DOCTYPE> declaration:

<!DOCTYPE html>
<html>
  <head>
    <title>My HTML Document</title>
  </head>
  <body>
    <h1>Hello, World!</h1>
    <p>This is a sample paragraph.</p>
  </body>
</html>

In this example, the <!DOCTYPE html> declaration specifies that the document is using HTML5.

It is important to always include the <!DOCTYPE> declaration at the beginning of your HTML documents to ensure proper rendering and compatibility across different browsers.