Flex supports both camel-case and hyphenated syntax in style sheets

             
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
    <mx:Style>
      .myFontStyle {
         fontSize: 15;
      }
     .myOtherFontStyle {
         font-size: 15;
      }
    </mx:Style>
    <mx:Button id="myButton" styleName="myFontStyle" label="Click Here"/>
    <mx:Button id="myButton2" styleName="myOtherFontStyle" label="Click Here"/>
    <mx:Button id="myButton3" fontSize="15" label="Click Here"/>
</mx:Application>

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Flex supports both camel-case and hyphenated syntax in style sheets : Style « Style « Flex

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