Test site
Every load of this page reports a pageview and, once you leave or switch tabs, its Core Web Vitals. The controls below make the numbers move.
Interactions (INP)
A fast click, a click that blocks the main thread for 300 ms, and one for 800 ms.
Layout shift (CLS)
Inserts a banner above this card without reserving space for it.
Events and revenue
Custom event, a declarative event, and a revenue event in EUR.
Keyboard and checkout return
A focusable div that fires on Enter or Space, and a link that comes back like a Stripe checkout.
Return with ?session_id=cs_…Visitor id the collector answered with: none yet
Navigation
An in-page route change (no new vitals) and an outbound link.
Outbound to tracing.toolsScroll goal
Fires reached_bottom once, after half of this card has been on screen for 500 ms.
Then
Switch tabs or close the page. The vitals report is sent on visibilitychange.