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.class1.class2
Element that has both class1 and class2 set within it's class attribute (like that: class="class1 class2")
class1
class2
class
class="class1 class2"
.class1 .class1class2
Element with class2 that is a descendant of an element with class1 class
.class1 .class1
.class1 .class2