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HTML DOM Window top( ) Property

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The Window top() property is used to return the topmost browser window of a current window. It is a read-only property and it returns a reference to the topmost window in the window hierarchy.

Return Value: It returns the reference of the topmost window in the window hierarchy.

Below program illustrates the Window top() property :
Checking whether the window is the topmost browser window or not. 


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


After clicking the button 

Supported Browsers: The browser supported by Window top( ) Property are listed below: 

  • Google Chrome 1 and above
  • Edge 12 and above
  • Internet Explorer 4 and above
  • Firefox 1 and above
  • Opera 12.1 and above
  • Safari 3 and above


Last Updated : 15 Jun, 2023
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