This example allows the user to enter a URL, which is then retrieved and
displayed in a <span>. This demonstrates that what is retrieved is NOT
treated as an HTML document but rather a simple stream of data, hence the
document is not parsed and page events don't fire, images don't get retrieved,
etc.
Note that you will get a security warning if the domain you are accessing
is not the same as this example (which I assume it won't be). In fact,
some browsers will not allow this (Firefox), while others will with a
warning (IE).