This new API will give developers a chance to create custom data types for inputs and outputs as well as enable certain custom functions. Excel developers will be able to create their own add-ins or ...

You can use dialog boxes for tasks such as displaying sign-in pages that can't be opened directly in a task pane, requesting that the user confirm an action, or hosting videos that might be too small ...

Microsoft is opening up Excel to developers with a new JavaScript API. It will let developers use custom data types like images, cards, and arrays.