HTMLImageElement.width

The width property of the HTMLImageElement interface indicates the width at which the image is drawn, in CSS pixels if the image is being drawn or rendered to any visual medium such as the screen or a printer; otherwise, it's the natural, pixel density corrected width of the image.

Syntax

htmlImageElement.width = newWidth;
let width = htmlImageElement.width;

Value

An integer value indicating the width of the image. The terms in which the width is defined depends on whether the image is being rendered to a visual medium or not.

• If the image is being rendered to a visual medium such as a screen or printer, the width is expressed in CSS pixels.
• Otherwise, the image's width is represented using its natural (intrinsic) width, adjusted for the display density as indicated by naturalWidth.

Example

In this example, two different sizes are provided for an image of a clock using the srcset attribute. One is 200px wide and the other is 400px wide. Further, the sizes attribute is provided to specify the width at which the image should be drawn given the viewport's width.

HTML

Specifically, for viewports up to 400px wide, the image is drawn at a width of 200px; otherwise, it's drawn at 400px.

<p>Image width: <span class="size">?</span>px (resize to update)</p>
<img src="/files/16864/clock-demo-200px.png"
      alt="Clock"
      srcset="/files/16864/clock-demo-200px.png 200w,
          /files/16797/clock-demo-400px.png 400w"
      sizes="(max-width: 400px) 200px, 400px">

JavaScript

The JavaScript code looks at the width to determine the width of the image at the moment. This is done in the window's load and resize event handlers, in order to always provide this information.

var clockImage = document.querySelector("img");
let output = document.querySelector(".size");

const updateWidth = event => { output.innerText = clockImage.width; };

window.addEventListener("load", updateWidth);
window.addEventListener("resize", updateWidth);

Result

This example may be easier to try out in its own window.

Specifications

Browser compatibility