Re: notifications I think it's a smart move. Back when I was content lead for https://web.dev I was floating around ideas along the same lines. Web developers learn of great new feature X and are disappointed to learn that it's only supported on a single browser. They then forget about the feature for years even though in the meantime it has been implemented on all their target browsers. Notifications of some sort solves this problem. I agree however that whether people will pay for this feature is debatable. Browser vendors should be incentivized to provide this feature for free somehow because it's in their own best interest to increase adoption of new web platform features.