That'd be the View Transition API. Specifically, it is a cross-document view transition. https://developer.chrome.com/docs/web-platform/view-transitions/cross-d

That'd be the View Transition API. Specifically, it is a cross-document view transition. https://developer.chrome.com/docs/web-platform/view-transitions/cross-document https://developer.chrome.com/docs/web-platform/view-transiti... Really awesome new(ish) feature of the web platform. It doesn't yet have full support in Firefox unfortunately, but is supported in Chrome and Safari.