Missing basic DOM operation: Element.replaceWith

[strelec]

Pretty much supported in all browsers: https://caniuse.com/mdn-api_element_replacewith
DOM Standard: https://dom.spec.whatwg.org/#interface-childnode
MDN: https://developer.mozilla.org/en-US/docs/Web/API/Element/replaceWith

[armanbilge]

Thanks, PRs happily accepted! :)