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<!DOCTYPE html> <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> </html>
