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The JavaScript Window resizeBy() method is used to resize the current browser window by a specified amount. It takes two arguments: the number of pixels to increase or decrease the width of the window, and the number of pixels to increase or decrease the height of the window. It does not return a value.

Here are some examples of how the resizeBy() method can be used in JavaScript code:

1. To resize the current window by a specific amount, you can use the following code:

window.resizeBy(100, 50);

2. To maximize the current window, you can use the following code:

// get the screen width and height
var screenWidth = window.screen.availWidth;
var screenHeight = window.screen.availHeight;

// resize the window to the screen dimensions
window.resizeBy(screenWidth - window.outerWidth, screenHeight - window.outerHeight);

3. To resize the current window to a specific size, you can use the following code:

// calculate the width and height difference
var widthDiff = 800 - window.outerWidth;
var heightDiff = 600 - window.outerHeight;

// resize the window to the specified dimensions
window.resizeBy(widthDiff, heightDiff);

Overall, the resizeBy() method provides a convenient way to resize the current browser window by a specified amount. It can be used for tasks such as maximizing the window, resizing it to a specific size, or other operations that require modifying the window’s dimensions.