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<html><body><h1>The Window Object</h1><h2>The self and top Properties</h2><p id="demo"></p><script>let text;if (window.top != window.self) { text = "This is not the topmost window! Am I in a frame?";} else { text = "This is the topmost window!";} document.getElementById("demo").innerHTML = text;</script></body><!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_win_self_top by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 21 Dec 2022 17:39:29 GMT --></html>