HTML DOM Window self( ) Property

The Window self() property is used for returning the current window. It is generally used for comparison purposes while using other functions such as top().
It is a read-only property and it returns a reference to the Window object itself.
Syntax:

window.self

Return Value: Return reference of the Window object.

Below program illustrates the Window self() property:
Using Window self() property for comparison with the window top() property.

html

<!DOCTYPE>
<html>
  
<head>
    <title>
      Window self() property in HTML
    </title>
    <style>
        h1 {
            color: green;
        }
          
        h2 {
            font-family: Impact;
        }
          
        body {
            text-align: center;
        }
    </style>
</head>
  
<body>
  
    <h1>GeeksforGeeks</h1>
    <h2>Window self() Property</h2>
  
      
  
<p>
      For checking whether the window is the topmost
      window or not, double click the "Check Top Window"
      button: </p>
  
  
  
    <button ondblclick="Window()">
      Check Top Window
    </button>
  
    <p id="MyWindow"></p>
  
  
  
    <script>
        function Window() {
            if (window.top = window.self) {
                document.getElementById("MyWindow").innerHTML =
                    "This window is the topmost window.";
            } else {
                document.getElementById("demo").innerHTML =
                    "This window is not the topmost window.";
            }
        }
    </script>
</body>
  
</html>