Function isSameOriginFrame

lib/assets/react-source/development/react.js:10617–10630

(iframe)

	}

	function isSameOriginFrame(iframe) {
	  try {
	    // Accessing the contentDocument of a HTMLIframeElement can cause the browser
	    // to throw, e.g. if it has a cross-origin src attribute.
	    // Safari will show an error in the console when the access results in "Blocked a frame with origin". e.g:
	    // iframe.contentDocument.defaultView;
	    // A safety way is to access one of the cross origin properties: Window or Location
	    // Which might result in "SecurityError" DOM Exception and it is compatible to Safari.
	    // https://html.spec.whatwg.org/multipage/browsers.html#integration-with-idl
	    return typeof iframe.contentWindow.location.href === 'string';
	  } catch (err) {
	    return false;
	  }
	}

	function getActiveElementDeep() {
	  var win = window;