Window.innerWidth
The read-only Window
property
innerWidth
returns the interior width of the window in
pixels. This includes the width of the vertical scroll bar, if one is present.
More precisely, innerWidth
returns the width of the window's
layout viewport. The interior height of the window—the height of the
layout viewport—can be obtained from the innerHeight
property.
Value
An integer value indicating the width of the window's layout viewport in pixels. This property is read-only, and has no default value.
To change the window's width, use one of the Window
methods for resizing
windows, such as resizeBy()
or
resizeTo()
.
Usage notes
If you need to obtain the width of the window minus the scrollbar and borders, use the
root <html>
element's clientWidth
property instead.
The innerWidth
property is available on any window or object that behaves
like a window, such as a frame or tab.
Examples
// This will return the width of the viewport
var intFrameWidth = window.innerWidth;
// This will return the width of the frame viewport within a frameset
var intFrameWidth = self.innerWidth;
// This will return the width of the viewport of the closest frameset
var intFramesetWidth = parent.innerWidth;
// This will return the width of the viewport of the outermost frameset
var intOuterFramesetWidth = top.innerWidth;
Demo
HTML
<p>Resize the browser window to fire the <code>resize</code> event.</p>
<p>Window height: <span id="height"></span></p>
<p>Window width: <span id="width"></span></p>
JavaScript
const heightOutput = document.querySelector("#height");
const widthOutput = document.querySelector("#width");
function resizeListener() {
heightOutput.textContent = window.innerHeight;
widthOutput.textContent = window.innerWidth;
}
window.addEventListener("resize", resizeListener);
Result
You can also view the results of the demo code in a separate page.
Specifications
Specification |
---|
CSSOM View Module # dom-window-innerwidth |
Browser compatibility
BCD tables only load in the browser