No. It should be done the way like Slack does it: - You want to get Notifications for Messages? Click here

So that you actually know what it's used for

I'm dealing with a bug currently where Slack doesn't keep track of whether I've enabled notifications, so I always get the banner. I think I'd go mad if every website did that :(

Not if you close Tab before clicking :)

There's the middle ground where I can freely browse the page without ever being prompted so see notifications. Apple gets this right.