improper nesting	/tools/validator/problems.html#nesting
comment syntax	/reference/html40/structure.html#comments
inline element	/reference/html40/inline.html
block-level element	/reference/html40/block.html
doctype	/tools/validator/doctype.html
document type declaration	/tools/validator/doctype.html
xml	http://www.w3.org/XML/
non-empty elements	http://www.w3.org/TR/xhtml1/#h-4.3
empty elements	http://www.w3.org/TR/xhtml1/#h-4.6
attribute minimization	http://www.w3.org/TR/xhtml1/#h-4.5
html 4.01 transitional	/tools/validator/doctype.html#html4transitional
html 4.01 frameset	/tools/validator/doctype.html#html4frameset
html 4.01	http://www.w3.org/TR/html401/
html 4.0 transitional	/tools/validator/doctype.html#html4transitional
html 4.0 frameset	/tools/validator/doctype.html#html4frameset
html 4.0	/reference/html40/
a	/reference/html40/special/a.html
abbr	/reference/html40/phrase/abbr.html
acronym	/reference/html40/phrase/acronym.html
address	/reference/html40/block/address.html
applet	/reference/html40/special/applet.html
area	/reference/html40/special/area.html
b	/reference/html40/fontstyle/b.html
base	/reference/html40/head/base.html
basefont	/reference/html40/special/basefont.html
bdo	/reference/html40/special/bdo.html
big	/reference/html40/fontstyle/big.html
blockquote	/reference/html40/block/blockquote.html
body	/reference/html40/html/body.html
br	/reference/html40/special/br.html
button	/reference/html40/forms/button.html
caption	/reference/html40/tables/caption.html
center	/reference/html40/block/center.html
cite	/reference/html40/phrase/cite.html
code	/reference/html40/phrase/code.html
col	/reference/html40/tables/col.html
colgroup	/reference/html40/tables/colgroup.html
dd	/reference/html40/lists/dd.html
del	/reference/html40/phrase/del.html
dfn	/reference/html40/phrase/dfn.html
dir	/reference/html40/lists/dir.html
div	/reference/html40/block/div.html
dl	/reference/html40/lists/dl.html
dt	/reference/html40/lists/dt.html
em	/reference/html40/phrase/em.html
fieldset	/reference/html40/forms/fieldset.html
font	/reference/html40/special/font.html
form	/reference/html40/forms/form.html
frame	/reference/html40/frames/frame.html
frameset	/reference/html40/frames/frameset.html
h1	/reference/html40/block/h1.html
h2	/reference/html40/block/h2.html
h3	/reference/html40/block/h3.html
h4	/reference/html40/block/h4.html
h5	/reference/html40/block/h5.html
h6	/reference/html40/block/h6.html
head	/reference/html40/head/head.html
hr	/reference/html40/block/hr.html
html	/reference/html40/html/html.html
i	/reference/html40/fontstyle/i.html
iframe	/reference/html40/special/iframe.html
img	/reference/html40/special/img.html
input	/reference/html40/forms/input.html
ins	/reference/html40/phrase/ins.html
isindex	/reference/html40/block/isindex.html
kbd	/reference/html40/phrase/kbd.html
label	/reference/html40/forms/label.html
legend	/reference/html40/forms/legend.html
li	/reference/html40/lists/li.html
link	/reference/html40/head/link.html
map	/reference/html40/special/map.html
menu	/reference/html40/lists/menu.html
meta	/reference/html40/head/meta.html
noframes	/reference/html40/frames/noframes.html
noscript	/reference/html40/block/noscript.html
object	/reference/html40/special/object.html
ol	/reference/html40/lists/ol.html
optgroup	/reference/html40/forms/optgroup.html
option	/reference/html40/forms/option.html
p	/reference/html40/block/p.html
param	/reference/html40/special/param.html
pre	/reference/html40/block/pre.html
q	/reference/html40/special/q.html
s	/reference/html40/fontstyle/s.html
samp	/reference/html40/phrase/samp.html
script	/reference/html40/special/script.html
select	/reference/html40/forms/select.html
small	/reference/html40/fontstyle/small.html
span	/reference/html40/special/span.html
strike	/reference/html40/fontstyle/strike.html
strong	/reference/html40/phrase/strong.html
style	/reference/html40/head/style.html
sub	/reference/html40/special/sub.html
sup	/reference/html40/special/sup.html
table	/reference/html40/tables/table.html
tbody	/reference/html40/tables/tbody.html
td	/reference/html40/tables/td.html
textarea	/reference/html40/forms/textarea.html
tfoot	/reference/html40/tables/tfoot.html
th	/reference/html40/tables/th.html
thead	/reference/html40/tables/thead.html
title	/reference/html40/head/title.html
tr	/reference/html40/tables/tr.html
tt	/reference/html40/fontstyle/tt.html
u	/reference/html40/fontstyle/u.html
ul	/reference/html40/lists/ul.html
var	/reference/html40/phrase/var.html