It should be possible to refer explicitly to something particular on a web page. To anything, whether or not the page's author thought to assign it a (secret) labeled ahead of time.  

The most obvious way to mostly provide this, it seems to me, is for the HTTP URL syntax to include a way to specify a search string at the end, which the browser simply plugs into its own Find function after loading the page. I will randomly suggest that since we already have "#" for fragments at the end of a URL, and valid fragment IDs must begin with an alphanumeric or an underscore, "#=" could be used for passing search text. So where  

http://www.furia.com/page.cgi?type=log&id=273  

refers to this blog-entry as a whole page, you could also do  

http://www.furia.com/page.cgi?type=log&id=273#=this+phrase  

to refer directly to this phrase.  

For extra credit we could also support "@" and a number for getting to the Nth use of that text. So  

http://www.furia.com/page.cgi?type=log&id=273#=this+phrase@2  

would refer directly to this phrase, not the one above.  

Useful, semantically reasonable, eminently implementable.  
 

[See the discussion on vF.]