Resizes the current window by a certain 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 for a web site 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 compatability table for details on the change.
Also, even if you create window by
window.open(...) it is not resizable by default. To make window created by
window.open() resizable, you must open it with resizable feature.
Creating and resizing an external window with "resizable" feature
myExternalWindow = window.open("http://myurl.domain", "myWindowName", "resizable"); myExternalWindow.resizeTo(500,500); //resize window to 500x500 myExternalWindow.resizeBy(-100,-100); //make it smaller relatively => to 400x4
The window you create must respect the Same Origin Policy. If the window you open is not in the same orgin as the current window, you will not be able to resize, or access any information on, that window/tab.
|CSS Object Model (CSSOM) View Module
The definition of 'window.resizeBy()' in that specification.
|Feature||Android webview||Chrome for Android||Edge mobile||Firefox for Android||Opera Android||iOS Safari||Samsung Internet|
1. Since Firefox 7, it's no longer possible for a web site 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 here for more details.