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When you use HTML to develop a Web page’s layout, there are few guarantees that it’ll look right for everyone who views the page. This is because of the vast number of browsers out there, each with its own quirks. Fortunately, when you lay out applications using Flex, your content will only run using the Flash Player or Adobe AIR, so the look you create will be much more reliable.
Note
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| The layout options are a significant change in Flex 4, making use of new Spark components. Older Flex code uses Halo components for layout control. |