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$ perl
use CGI;
...
^D
HTML escaped: a9: _-;&<tag>'"
URL escaped:  a9%3A%20_-%3B%26%3Ctag%3E'%22

2.4.3. Excluded US-ASCII Characters

...

   Data corresponding to excluded characters must be escaped in order 
+to
   be properly represented within a URI.

<a href="http://google.com/search?q=super search">unescaped space</a>
<a href="http://google.com/search?q=super%20search">escaped space</a>
<a href="http://google.com/search?q=super&amp;search">entity amp</a>
<a href="http://google.com/search?q=super%26search">url-escaped amp</a
+>