Doesn't really evoke confidence, if this is a Google initiative. Can someone post a short precis as to what this is about for those of us who cannot visit the URLs?
UPDATE: Apologies - My bad, not Google's fault. I had a local Valet/NGINX redirect for local .dev domains setup for Laravel development projects that was causing the issue.
Oh, and this is definitely a valid Google initiative. Source: Work for Google, am involved in this.
Apologies for that - I will shut down the Valet service and try again.
Although that might only change the default for new installs; you might still need to change it for existing installs. I'm not sure; I've never used Laravel.
From the site: "With actionable guidance and analysis, web.dev helps developers like you learn and apply the web's modern capabilities to your own sites and apps."
It includes a web version of the Lighthouse website measurement tool. It also has guides for various web dev topics.
The topics can be browsed normally, but I think most users will discover topics by the measurement tool showing the user guides to improve their website.