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Returns a value for the "class" attribute
unique to this controller/action pair.
This can be used to target styles specifically at this action or controller.
For example, if the current action were `EntryController#show`,

    %div{:class => page_class} My Div

would become

    <div class="entry show">My Div</div>

Then, in a stylesheet (shown here as [Sass](http://sass-lang.com)),
you could refer to this specific action:

      font-weight: bold

or to all actions in the entry controller:

      color: #00f

@return [String] The class name for the current page
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