Window.resizeBy() method resizes the current window
by a specified amount.
xDeltais the number of pixels to grow the window horizontally.
yDeltais the number of pixels to grow the window vertically.
// Shrink the window window.resizeBy(-200, -200);
This method resizes the window relative to its current size. To resize the window in
absolute terms, use
For security reasons, it's no longer possible in Firefox for a website to change the
default size of a window in a browser if the window wasn't created by
window.open(), or contains more than one tab. See the compatibility table
for details on the change.
Even if you create window by
window.open() it is not resizable by
default. To make the window resizable, you must open it with the
// Create resizable window myExternalWindow = window.open( "https://example.com", "myWindowName", "resizable", ); // Resize window to 500x500 myExternalWindow.resizeTo(500, 500); // Make window relatively smaller to 400x400 myExternalWindow.resizeBy(-100, -100);
The window you create must respect the Same Origin Policy. If the window you open is not in the same origin as the current window, you will not be able to resize, or access any information on, that window/tab.
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