org-html-doctype-alist

org-html-doctype-alist is a variable defined in `ox-html.el'.
Its value is shown below.

• This variable may be risky if used as a file-local variable.

Documentation:
An alist mapping (x)html flavors to specific doctypes.

Value:

(("html4-strict" . "")
 ("html4-transitional" . "")
 ("html4-frameset" . "")
 ("xhtml-strict" . "")
 ("xhtml-transitional" . "")
 ("xhtml-frameset" . "")
 ("xhtml-11" . "")
 ("html5" . "")
 ("xhtml5" . ""))