(This should be feasible after #465 is resolved.)
Basic info: https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/outerText
HTMLElement.outerText appears to be supported in all major browsers except Firefox, but currently doesn't seem to be spec'd anywhere.
Its getter seems to return the same value as innerText.
Its setter removes the element and replaces it with the given raw text string (no HTML parsing).