org.danielnixon.saferdom.implicits.lib
Returns the element (such as <iframe> or <object>) in which the window is embedded, or null if the window is top-level.
Returns the element (such as <iframe> or <object>) in which the window is embedded, or null if the window is top-level.
MDN
https://html.spec.whatwg.org/#the-window-object