MAT 125: Web Design 1: Fundamentals : Using Doctypes
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What is a DOCTYPE?
Without a DOCTYPE, the browser goes to "Quirks" mode - complying with outdated standards from the late 1990's.
Doctypes come in different standards. Strict ones are exactly that, they expect your code to be completely compliant to work correctly. Transitional ones are the easiest ones to use. They are more forgiving. You should work towards making your code completely XHTML compliant. This means an end tag for every tag you open (the empty tags such as img or br are the space and then the slash - />), using quote marks for every value, all tags written in lower case letters. The more we all use this standard, the sooner browsers will display our hard work more consistently.
Choose one, copy and paste it in the head of your document.
As you can see, the doctype for HTML5 is very simple
HTML 4.01 Strict or Transitional
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
XHTML 1.0 Strict or Transitional
STRICT 1.0 XHTML:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
XHTML 1.1 DTD
STRICT XHTML 1.1:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">