The browser support for excel add-in is on my own site or the excel online app?

The Microsoft Documentation says

An Excel add-in allows you to extend Excel application functionality across multiple platforms including Windows, Mac, iPad, and in a browser

Does browser mean my own website/web app or the online excel app that Microsoft has at https://office.live.com? I have been through the documentation, but couldn't find the answer.

Solution

On the web The Excel JavaScript addins interact with Excel Online which runs in a browser.

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