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Tab-delimited, copied from http://www.w3schools.com/tags/html5.asp on 10/7/2009
Mapping of tag name to short desc, then if it's supported in HTML 4 and/or 5

a 	Defines a hyperlink 	4 	5
abbr 	Defines an abbreviation 	4 	5
acronym 	Not supported. Defines an acronym 	4 	 
address 	Defines an address element 	4 	5
applet 	Not supported. Defines an applet 	4 	 
area 	Defines an area inside an image map 	4 	5
article 	Defines an article 	  	5
aside 	Defines content aside from the page content 	  	5
audio 	Defines sound content 	  	5
b 	Defines bold text 	4 	5
base 	Defines a base URL for all the links in a page 	4 	5
basefont 	Not supported. Use CSS instead 	4 	 
bdo 	Defines the direction of text display 	4 	5
big 	Not supported. Defines big text 	4 	 
blockquote 	Defines a long quotation 	4 	5
body 	Defines the body element 	4 	5
br 	Inserts a single line break 	4 	5
button 	Defines a push button 	4 	5
canvas 	Defines graphics 	  	5
caption 	Defines a table caption 	4 	5
center 	Not supported. Defines centered text 	4 	 
cite 	Defines a citation 	4 	5
code 	Defines computer code text 	4 	5
col 	Defines attributes for table columns  	4 	5
colgroup 	Defines groups of table columns 	4 	5
command 	Defines a command button 	  	5
datagrid 	Defines data in a tree-list 	  	5
datalist 	Defines a dropdown list 	  	5
datatemplate 	Defines a data template 	  	5
dd 	Defines a definition description 	4 	5
del 	Defines deleted text 	4 	5
details 	Defines details of an element 	  	5
dialog 	Defines a dialog (conversation) 	  	5
dir 	Not supported. Defines a directory list 	4 	 
div 	Defines a section in a document 	4 	5
dfn 	Defines a definition term 	4 	5
dl 	Defines a definition list 	4 	5
dt 	Defines a definition term 	4 	5
em 	Defines emphasized text  	4 	5
embed 	Defines external interactive content or plugin 	  	5
eventsource 	Defines a target for events sent by a server 	  	5
fieldset 	Defines a fieldset 	4 	5
figure 	Defines a group of media content, and their caption 	  	5
font 	Deprecated. Defines text font, size, and color 	4 	 
footer 	Defines a footer for a section or page 	  	5
form 	Defines a form  	4 	5
frame 	Not supported. Defines a sub window (a frame) 	4 	 
frameset 	Not supported. Defines a set of frames 	4 	 
h1		Defines header 1	4	5
h2		Defines header 2	4	5
h3		Defines header 3	4	5
h4		Defines header 4	4	5
h5		Defines header 5	4	5
h6		Defines header 6	4	5
head 	Defines information about the document 	4 	5
header 	Defines a header for a section or page 	  	5
hr 	Defines a horizontal rule 	4 	5
html 	Defines an html document 	4 	5
i 	Defines italic text 	4 	5
iframe 	Defines an inline sub window (frame) 	4 	5
img 	Defines an image 	4 	5
input 	Defines an input field 	4 	5
ins 	Defines inserted text 	4 	5
isindex 	Not supported. Defines a single-line input field 	4 	 
kbd 	Defines keyboard text 	4 	5
label 	Defines a label for a form control 	4 	5
legend 	Defines a title in a fieldset 	4 	5
li 	Defines a list item 	4 	5
link 	Defines a resource reference 	4 	5
mark 	Defines marked text 	  	5
map 	Defines an image map  	4 	5
menu 	Defines a menu list 	4 	5
meta 	Defines meta information 	4 	5
meter 	Defines measurement within a predefined range 	  	5
nav 	Defines navigation links 	  	5
nest 	Defines a nestingpoint in a datatemplate 	  	5
noframes 	Not supported. Defines a noframe section 	4 	 
noscript 	Defines a noscript section 	4 	5
object 	Defines an embedded object 	4 	5
ol 	Defines an ordered list 	4 	5
optgroup 	Defines an option group 	4 	5
option 	Defines an option in a drop-down list 	4 	5
output 	Defines some types of output 	  	5
p 	Defines a paragraph 	4 	5
param 	Defines a parameter for an object 	4 	5
pre 	Defines preformatted text 	4 	5
progress 	Defines progress of a task of any kind 	  	5
q 	Defines a short quotation 	4 	5
rule 	Defines the rules for updating a template 	  	5
s 	Not supported. Defines strikethrough text 	4 	 
samp 	Defines sample computer code 	4 	5
script 	Defines a script 	4 	5
section 	Defines a section 	  	5
select 	Defines a selectable list 	4 	5
small 	Defines small text 	4 	5
source 	Defines media resources 	  	5
span 	Defines a section in a document 	4 	5
strike 	Not supported. Defines strikethrough text 	4 	 
strong 	Defines strong text 	4 	5
style 	Defines a style definition 	4 	5
sub 	Defines subscripted text 	4 	5
sup 	Defines superscripted text 	4 	5
table 	Defines a table 	4 	5
tbody 	Defines a table body 	4 	5
td 	Defines a table cell 	4 	5
textarea 	Defines a text area 	4 	5
tfoot 	Defines a table footer 	4 	5
th 	Defines a table header 	4 	5
thead 	Defines a table header 	4 	5
time 	Defines a date/time 	  	5
title 	Defines the document title 	4 	5
tr 	Defines a table row 	4 	5
tt 	Not supported. Defines teletype text 	4 	 
u 	Not supported. Defines underlined text 	4 	 
ul 	Defines an unordered list 	4 	5
var 	Defines a variable 	4 	5
video 	Defines a video 	  	5
xmp 	Not supported. Defines preformatted text 	4 	 