Modifying an html file using tidy tool

I have been exploring html tidy(command line tool) for modifying html pages,
i had picked the html souce from the website www.slate.com, when i tried to
modify this webpage using the command tidy.exe -f err.txt -m slate.html  i
had noticed that its not being modified.

Also i do see the same behavior when i pick the code from
www.huffingtonpost.com and try to modify using the tidy tool, the html page
is not being modified

I had tried with some other sites and it worked out well, wanted to know why
tidy is unable to modify the hmtl code that i had copied from slate.com
site, can anyone reply back. Is it so that tidy will modify only some sort
of html files not all.  http://old.nabble.com/file/p29021579/Slate.html
Slate.html  http://old.nabble.com/file/p29021579/Huffing.html Huffing.html 
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Received on Wednesday, 30 June 2010 10:07:32 UTC