It's a clever idea and it's super simple Add an event listener on the entire document.body Get the event.target and the style and then descend to the children

It's a clever idea and it's super simple Add an event listener on the entire document.body Get the event.target and the style and then descend to the children. Put it formatted in the clipboard. Then do it as a bookmarklet and deregister the click handler when you're done so you can continue interacting with the site It's probably around 12 lines of modern js. You can add a fancy graphical outline to know what you're selecting with a few more lines. Just make sure you draw it on top and don't modify the elements. Use a css filter to make it work on all elements. Modern tooling is pretty great.