disclaimer “pop up”

[DanielWelch]

Are there some examples of a disclaimer “pop up” that must be acknowledged before the user can move
forward used in ArcGIS on line. It seems the usage of
disclaimers is rather fickle.

[XanderBakker]

If you would use the Web App Builder you would be able to use the Splash widget:

Splash widget—Web AppBuilder for ArcGIS | ArcGIS