Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The element read-only property of the CSSPseudoElement interface returns a reference to the ultimate originating element of the pseudo-element.
This differs from the CSSPseudoElement.parent property, which returns a reference to the pseudo-element's immediate originating element: This can be either an Element, or a CSSPseudoElement in the case of a nested pseudo-element.
An Element representing the pseudo-element's ultimate originating parent element.
The example below demonstrates the relationship between CSSPseudoElement.element and Element.pseudo():
const myElement = document.querySelector("q");
const cssPseudoElement = myElement.pseudo("::after");
const originatingElement = cssPseudoElement.element;
console.log(myElement === originatingElement); // Outputs true
console.log(myElement.parentElement === originatingElement); // Outputs false
console.log(myElement.lastElementChild === cssPseudoElement); // Outputs false
console.log(myElement.lastChild === cssPseudoElement); // Outputs false
console.log(myElement.nextElementSibling === cssPseudoElement); // Outputs false
console.log(myElement.nextSibling === cssPseudoElement); // Outputs false