What html tags are allowed by wordpress.com?

Question: What html tags are allowed by wordpress.com?
Following HTML Tags are allowed in wordpress.com
.

 
address,
a, 
abbr, 
acronym, 
area, 
article, 
aside, 
b, 
big, 
blockquote, 
br, 
caption, 
cite, 
class, 
code, 
col, 
del, 
details, 
dd, 
div, 
dl, 
dt, 
em, 
figure, 
figcaption, 
footer, 
font, 
h1, h2, h3, h4, h5, h6, header, hgroup, hr, i, img, ins, kbd, li, map, ol, p, pre, q, s, section, small, span, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, var

Question: Can we add javascript in wordpress.com?
No, You can add.
script Tags are not allowed.



Question: How to embed youtube video?
Just add following code in post.

[youtube=http://www.youtube.com/watch?v=w0wflz6Iwqs]

Question: Give list of URL which videos is allowed by wordpress.com?

 
YouTube
Vimeo
DailyMotion
blip.tv
Flickr (both videos and images)
Viddler
Hulu
Qik
Revision3
Scribd
Photobucket
PollDaddy
Google Video
WordPress.tv (only VideoPress-type videos for the time being)
SmugMug (WordPress 3.0+)
FunnyOrDie.com (WordPress 3.0+)

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