HTML DOM Window resizeBy() Method

The resizeBy() method in HTML Window is used to resize a window by the specified amount, relative to its current size.

Syntax:

resizeBy(width, height)

property value:

width: A that specifies the resize pixels of width.
height: A that specifies the resize pixels of height.

Example:

html

<!DOCTYPE html>
<html>
  
<head>
    <title>
      Window resizeBy() Method
  </title>
    <style>
        h1 {
            color: green;
        }
    </style>
</head>
  
<body>
    <center>
        <h1>
          Geeks for Geeks
      </h1>
        <button onclick="openWin()">
          New window
      </button>
        <button onclick="resizeWin()">
          Resize window
      </button>
  
        <script>
            var myWindow;
  
            function openWin() {
                myWindow = 
                  window.open("", "",
                              "width=100, height=100");
            }
  
            function resizeWin() {
                myWindow.resizeBy(300, 300);
                myWindow.focus();
            }
        </script>
    </center>
</body>
  
</html>