Not useless. (caveat untested code) Say you have a css:
Warning.*{
color=#YELLOW
}
and you code in your html
print "<SPAN CLASS="WARNING">"My warning</SPAN>";
all over the place, and then your phb says "make the warning section have a blue backround", all you have to do is update your css and then with no code change to current code base and a simple one line update to the css you're done!
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