Shadow DOM is a mechanism by which a browser can inject a subtree into the DOM, but it won't be visible to JS. This was often used for things like custom eleme

Shadow DOM is a mechanism by which a browser can inject a subtree into the DOM, but it won't be visible to JS. This was often used for things like custom elements (inputs and such). I presume it wasn't very popular to use the shadow dom in webkit. Far as I recall, there's also talk about using the shadow dom for injecting foreign fragments into the DOM in a secure manner (web components). Although there's probably ways to achieve this without the full shadow dom.