According to your screenshot you are inside an article, on the last slide. So that's not how it greets you on the actual website. Did you go to this url: https://www.useronboard.com/?
I visited the site, clicked on Apple Music, then a lot of images flickered around and the popup appeared. If I do it again now, it shows me a "like us on twitter" popup instead.
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I found this site https://www.useronboard.com/ to be quite a useful resource for looking at the on boarding process.
Ahahaha, and this is how I was greeted on it: https://i.imgur.com/YRCiRfU.png
Do as you say or what that saying was...
According to your screenshot you are inside an article, on the last slide. So that's not how it greets you on the actual website. Did you go to this url: https://www.useronboard.com/?
I visited the site, clicked on Apple Music, then a lot of images flickered around and the popup appeared. If I do it again now, it shows me a "like us on twitter" popup instead.
Do you use NoScript? I just tried with that and I experience the same as you describe.
I block third-party javascript of course. The popup's scripts worked fine.
uxarchive is another good one http://uxarchive.com/tasks/onboarding
Came here to say this. Can't recommend useronboard enough.