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Doctype Test

What is it?

Check for doctype declaration. A document type declaration, or DOCTYPE, defines which version of (X)HTML your webpage is using. Proper doctype declaration assists with proper page rendering and functioning of web documents in compliant browsers.

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How do I fix it?

Always add the <!DOCTYPE> declaration to your HTML documents, so that the browser knows what type of document to expect. This declaration must be the very first thing in your HTML document, before the <html> tag. You can see below the most common <!DOCTYPE> declarations:

  • HTML 5:
    <!DOCTYPE html>
    
  • HTML 4.01 Strict:
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
    
  • HTML 4.01 Transitional:
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    
  • XHTML 1.0 Strict:
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
    
  • XHTML 1.0 Transitional:
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    
  • XHTML 1.1:
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
    
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