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
js
// This will log the width of the viewport
console.log(window.innerWidth);
// This will log the width of the frame viewport within a frameset
console.log(self.innerWidth);
// This will log the width of the viewport of the closest frameset
console.log(parent.innerWidth);
// This will log the width of the viewport of the outermost frameset
console.log(top.innerWidth);
Demo
HTML
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
js
const heightOutput = document.querySelector("#height");
const widthOutput = document.querySelector("#width");
function updateSize() {
heightOutput.textContent = window.innerHeight;
widthOutput.textContent = window.innerWidth;
}
updateSize();
window.addEventListener("resize", updateSize);
Result
You can also view the results of the demo code in a separate page.
Specifications
| Specification |
|---|
| CSSOM View Module # dom-window-innerwidth |