Foolproof way to detect if this page is INSIDE a cross-domain iframe

Question

An answer to \"Foolproof way to detect if iframe is cross domain\" describes a method to test if an iframe on a page points to a same-domain or cross-domain page, working ar

Answer 1

Real cross-browser solution for posterity:

function isCrossOriginFrame() {
  try {
    return (!window.top.location.hostname);
  } catch (e) {
    return true;
  }
}

console.log(isCrossOriginFrame());

Tested on a decent swath of desktop and mobile browsers.

https://jsfiddle.net/arzd4btc/3/