Submit an add-in only for Excel Online - ms-office

I want to submit an add-in only for Excel Online (no Excel for Mac, no Excel for Windows).
Could anyone tell me if it is possible and how to configure the manifest xml file?

The Office store requires that the add-in works for Mac, Windows and Online with optional iPad support. It is not possible to select only some of the required platform. The same code that works on one platform should also work on the other with the addition effort being in the testing area.

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Is there a way of refering to an open Microsoft Edge browser from a VSTO add-in of Excel ? (as old excel addin could refer to IE)

I am trying to convert an old Excel add-in to a new VSTO version. The present add-in reads data from an open Internet Explorer browser.
Since I.E will no longer be supported shortly, I am looking for a solution with an advance developing technology. The above issue is a major point without which this solution ill not be applicable.
Any help with a sample snippet will help.

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

Outdated Windows Sideloading Instructions for Excel Add-in

There are instructions online for sideloading an addin into Excel for Windows.
However, I get stuck on step 4. Namely, there is no Manage My Add-in's button anywhere within the MY ADD-INS page that I can find.
Does this button still exist somewhere, or are the instructions out of date? If the button is gone, is there any other easy way of side-loading an add-in into Excel?
There are other instructions online for sideloading an add-in, but they are much more complicated and hard to follow.
Thanks for any information!
The page that you linked to is for sideloading in Excel on the web, not Windows. For Excel on Windows, see Sideload Office Add-ins for testing. BTW, its best to work with the help on the learn.microsoft.com domain. The GitHub repo that you linked to is the source files and its harder to find your way around there.

What is the correct way to write Excel UDF's so they work on Desktop, Web and Mobile Office

With the introduction of Excel on Android and iOS, I'm not sure what's the correct method of creating a UDF (User Defined Function) that will work across all versions of the Office 365?
I want my UDF to work on iPad, Android as well as Desktop. What's the official Microsoft way of supporting all of these versions of Office for UDF's?
There is no way to support all these platforms. It will work on the Desktop editon of Office.

Disable access to the Visual Basic editor in Mac Office

I've been working intermittently on an Excel spreadsheet for a customer that does some pretty intense calculations. We implemented a security procedure using VBA... At first the requirements were relatively simple, and the overall lack of security in a spreadsheet was discussed and well understood.
Since then the customer has decided that he would like to have the sheet a bit more secure. Under normal circumstances I would simply disable the developer menu via code. Unfortunately I just recently found out that the customer, and many of his customers, are using Mac Office. (There are some customers that are even using 2008 and they found out the hard way that 2008 stopped supporting VBA)
My question is; is it possible to disable access to the Visual Basic editor in Mac Office in versions Pre 2008, and versions 2011 and after since from the research I've done so far points to a return of VBA support in Mac Office in 2011.
Unfortunately I do not have access to a Mac Office version to even really look through the application and or/test different solutions. In Windows it is possible to right click the VBA project and choose protection from the VBAProject Properties and choose "Lock project for viewing". Does this option exist and is it effective in Mac Office?
Any help/suggestions would be greatly appreciated.
I'm pretty sure you can lock projects in Mac Office the same way you can in Windows. Keep in mind that a project that has been locked in one version of Excel cannot be unlocked with a different version. So, if your customer needs to be able to unlock, they will need to use the same version of Excel you used to lock it.

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