How to embed and edit online Excel spreadsheet or Word document?

Support
1

How to edit online, Excel or word? Can Discourse install onlyoffice?

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Now, only download

2

How far can you get with iframe?

It’s somewhat possible to embed a PowerPoint for viewing at least.

See:

Update: no such luck I suspect:

Embed your Excel workbook on your web page or blog from SharePoint or OneDrive for Business - Microsoft Support.