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HTML | Window top( ) Property
  • Last Updated : 26 Jul, 2019

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.


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
  • Internet Explorer
  • Firefox
  • Opera
  • Safari

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