Where the id is the unique key in the URL of the spreadsheet you're trying to embed. Make sure that the document is published (''Note: this is not uniquely the same as viewable with link; on the document, navigate to File>Publish to the Web'').

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Spreadsheets are essentially the same mechanism as documents (above), simply call Google Spreadsheet instead. For example:

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To call YouTube videos in documents, all you need is the video id (the unique key at the end of the video's URL). The height and width can be adjusted from the default 420x350 by adding <code>|height=xxx|width=xxx</code> after the id.<br>

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