The html5's DTD is most simply for text/html.
At first you must decrare that is <!DOCTYPE html>.
This tag is html5's decrare that can't include another words on this tag.
Next is <html>and <head>,<title></title>,<meta name=""><meta http-equiv=""><link></head>.
that is not shower on display,but it is most important word for web site.
Please serch for on safari <meta name=,<meta http-equiv,<link rel=.