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DOCTYPE
Strict Frameset Transitional

Toate documentele HTML trebuie sa inceapa cu o declaratie DOCTYPE care precizeaza tipul de document ce va fi creat. Ultimele specificatii ale consortiului W3C au definit trei DTD-uri (Document Type Definition):
  1. DTD HTML 4.01 strict, care defineste versiunea cea mai corecta a limbajului HTML 4, iar declaratia DOCTYPE va fi: 
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
  2. DTD HTML 4.01 frameset, care permite in plus crearea cadrelor: 
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 
Frameset//EN"
"http://www.w3.org/TR/html4/frameset.dtd">
  3. DTD HTML 4.01 transitional, care, in plus fata de elementele DTD-ului strict, suporta inca elemente nerecomandate ale versiunii 3.2. Multi creatori de pagini web nu folosesc acest DTD. 
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 
Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">