domserver

A Chrome extension that logs every block of HTML added to or removed from a page. One Manifest V3 content script runs in every frame from document start, so it also catches the page being parsed in, and a MutationObserver prints each change to the console as a collapsed group, green for added and red for removed, with the time, the node's own tag and a short selector path to its parent. A test page with add and remove buttons comes with it. Despite the name, there is no server.