Tumblr doctype . , AJAX .
HTML HTML-, . . , ( ) html head. , tumblr - , doctype, script. , , .
Knowing all this, we can make our tumblr sites valid without opening the html and head into our themes. HOWEVER, tumblr automatically adds extra code at the end of the head, and it will break the page if you do not actually put title tags.
Tumblr also puts a bunch of invalid attributes, duplicates meta tags, and gets too dirty. There is no way to make the tumblr site valid HTML in general, which is pretty awful.
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