How do I debug an Outlook web add-in?


I am trying to develop my first Outlook web add-in, by following this guide aiming eventually to add a button to the "compose" dialog that displays a pane with an AngularJs app.


I managed to add the add-in to the message read command surface. Although I did have make some mistakes with the manifest & was surprised that the Yeoman validate-office-addin said that my manifest was valid, but I could not add it to Outlook, owing to errors. Is there a better validator?


Next, I moved my button to the message compose surface & when I click it, the pane appears with the correct title, but a continuous "loading" image.


Question, how do I debug a custom web add-in which I have added into ?

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Note that I am not, so far, using Visual Studio