stylesheet 
<style type="text/css">
 div.\3042 { color: blue; } 
 div.\0041 { color: red; } 
 div.H\&K { color: green; }
</style>
blue! (class="‚ ")
blue! (class="&#x3042;"(="あ"))
red! (class="A")
red! (class="&#x0041;"(="A"))
green! (class="H&amp;K"(="H&K))