Window: resizeBy() method
The Window.resizeBy()
method resizes the current window
by a specified amount.
Syntax
resizeBy(xDelta, yDelta)
Parameters
xDelta
is the number of pixels to grow the window horizontally.yDelta
is the number of pixels to grow the window vertically.
Return value
None (undefined
).
Examples
// Shrink the window
window.resizeBy(-200, -200);
Notes
This method resizes the window relative to its current size. To resize the window in
absolute terms, use window.resizeTo()
.
Creating and resizing an external window
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
"resizable"
feature.
// 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.
Specifications
Specification |
---|
CSSOM View Module # dom-window-resizeby |
Browser compatibility
BCD tables only load in the browser
Note: This function might not resize the window synchronously.
In some environments (like mobile) it might not resize the window at all. You
can listen to the resize
event to see
if/when the window got resized.