Sign-in probe

Four ways the sign-in page could talk to Apple and Google. Open each one in every place below, sign in, and copy the report that follows. Nothing is kept: the page only reads what came back.

1. Apple in a popup: Apple answers this page by a message from its popup.
2. Apple by redirect: Apple sends the browser back with a cross-site POST.
3. Google in a popup
4. Google by redirect: Google sends the browser back with a cross-site POST.

Places: a desktop browser, Safari and a browser sheet on an iPhone, Chrome and a Custom Tab on an Android phone.

Apple Services ID: set. Google web client: set.

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