SO fiddle

Test Fiddle mainly for SO Questions

by Nick Craver

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.4/themes/overcast/jquery-ui.css">
<div class="parent1">
    <div class="subparent2">
        <div class="class1 class2 class3">Match</div>
        <div class="class1 class2">No Match</div>
    </div>
</div>

CSS

.parent1 .subparent2 .class1.class2.class3 { color:red; }