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Lists any domains, in addition to the domain specified in the SourceLocation element, that your Office Add-in will use and that should be trusted by Office. This enables pages in the domains to make calls to Office.js APIs from IFrames within the add-in and has other effects. For each additional domain, specify an <AppDomain> element.
Add-in type: Content, Task pane, Mail
Syntax
<AppDomains>
<AppDomain>AppDomain1</AppDomain>
<AppDomain>AppDomain2</AppDomain>
</AppDomains>
Important
There are restrictions on what can be the value of a <AppDomain> element. For more information, see AppDomain.
Contained in
Can contain
Remarks
By default, your add-in can load any page that is in the same domain as the location specified in the SourceLocation element. This element can't be empty.
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Office Add-ins