HTML 2.0 (RFC 1868)	HTML 2.x (RFC 2070)	HTML 3.2	HTML 4.01 Transitional / Frameset	HTML 4.01 Strict	ISO-HTML	XHTML 1.0 FE Transitional	XHTML 1.0 FE Frameset	XHTML 1.0 FE Strict	XHTML 1.0 SE Transitional	XHTML 1.0 SE Frameset	XHTML 1.0 SE Strict	XHTML 1.1 (m12n 1.0 FE/SE DTD)	XHTML 1.1 + Legacy (m12n 1.0 FE/SE DTD)	XHTML m12n 1.0 FE/SE Abstract
h1	O
h2
h3
h4
h5
h6
a	X														X
img	O
br
em
strong
code
samp
kbd
var
cite
tt
b
i
span		O		O
q
bdo
sup		O
sub
u			O				O			O				O
strike
big			O				O
small
dfn			O
applet			O				O			O				O
font														O
basefont
script			O				O
map			O
input
select
textarea
s				O			O			O				O
abbr				O
acronym
object
iframe				O			O			O				O
label				O
button
ins
del
noscript							O						O
ruby													O