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The Word Rich API Demo app helps you to learn and play with the new set of Word Rich APIs. You can open a document from Word or Word Online, and insert this demo app as a Taskpane Add-in.
You can do this by click the Insert menu item, then click the My Add-ins icon in the ribbon bar, and choose this app from Office STORE and insert it into your document, and the add-in will be displayed together with your document.