Snapshoots showing how the Microsft Edge toolbar looks when opening Google Calendar: In my case the above link takes me to a screen that looks as follow: Or click the Settings button then type 'protocol handlers' in the search box. Review the Protocol Handler settings Microsoft EdgeĮdge://settings/content/handlers?search=protocol%20handlers The details about how Google Calendar internally works are beyond the scope of Web Applications. This is not shown all the time because the default option might be to ignore it or the app use an algorithm to not be too anonying. This is responding to a check done by Google Calendar.
It's related to the web browser setting Protocol Handler.
The dialog is a standard feature of some modern web browsers.
