Allow users to expand or collapse the content panes to either side of the splitter. 

The panes are automatically resizeable and you can further customize the quick expand/collapse button which makes the user able to change the layout if needed.
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The contents within the splitter could be plain HTML templates, or you can link an entire page within the content area. With its multiple orientation support, the layout options are endless.
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Place any content inside your content pane templates. 
Split content into multiple sections. 

Split page contents into multiple sections using the web splitter controls for managing your page content and maintainability of your UI sections.
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The WebSplitter also eliminates the need for legacy html frameset elements, which are no longer supported in modern browsers.
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No more legacy html framesets required.