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<div class = "first">
<div class = "second">
<element>
</div>
</div>
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To specify multiple classes, separate the class names with a space,
e.g. <span class="classA classB">.
This allows you to combine several CSS classes for one HTML element.
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Multiple Classes
HTML elements can belong to more than one class.
To define multiple classes, separate the class names with a space,
e.g. <div class="city main">.
The element will be styled according to all the classes specified.