2.1.2.6 <!DOCTYPE> Declaration
The following table lists examples of the most common <!DOCTYPE> declarations and how they influence which document mode is used.
<!DOCTYPE> declaration | Document Mode Impact |
HTML 4.0 and higher <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN"> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN" "http://www.w3org/TR/html4/strict.dtd"> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3org/TR/html4/strict.dtd"> XHTML with or without a system identifier <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3org/TR/xhtml11/DTD/xhtml11.dtd"> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.0//EN" "http://www.w3org/TR/xhtml-basic/xhtml-basic10.dtd"> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3org/TR/xhtml1/DTD/xhtml1-strict.dtd"> Unknown <!DOCTYPE html> | Standards mode |
XHTML Transitional or Frameset <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN"> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhmlt1-transitional.dtd"> HTML 4.0 or HTML 4.01 Transitional or Frameset with a system identifier <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3org/TR/html4/loose.dtd"> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3org/TR/html4/loose.dtd"> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3org/TR/1999/REC-html401-19991224/loose.dtd"> | "Almost Standards" mode (standards mode in IE7) |
HTML 4 and lower, or no DOCTYPE <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> None | Quirks mode |
