The HTMLImageElement
interface's read-only naturalWidth
property returns the intrinsic (natural), density-corrected width of the image in CSS pixels. This is the width the image is if drawn with nothing constraining its width; if you neither specify a width for the image nor place the image inside a container that limits or expressly specifies the image width, this is the number of CSS pixels wide the image will be.
The corresponding naturalHeight
method returns the natural height of the image.
Syntax
let naturalWidth = htmlImageElement.naturalWidth;
Value
An integer value indicating the intrinsic width of the image, in CSS pixels. This is the width at which the image is naturally drawn when no constraint or specific value is established for the image. This natural width is corrected for the pixel density of the device on which it's being presented, unlike the value of width
.
If the intrinsic width is not available—either because the image does not specify an intrinsic width or because the image data is not available in order to obtain this information, naturalWidth
returns 0.
Example
This example simply displays both the natural, density-adjusted size of an image as well as its rendered size as altered by the page's CSS and other factors.
HTML
<div class="box">
<img src="/files/16797/clock-demo-400px.png" class="image">
</div>
<div class="output">
</div>
The HTML features a 400x398 pixel image which is placed inside a <div>
.
CSS
.box {
width: 200px;
height: 200px;
}
.image {
width: 100%;
}
.output {
padding-top: 2em;
}
The main thing of note in the CSS above is that the style used for the container the image will be drawn in is 200px wide, and the image will be drawn to fill its width (100%).
JavaScript
let output = document.querySelector(".output");
let image = document.querySelector("img");
window.addEventListener("load", event => {
output.innerHTML += `Natural size: ${image.naturalWidth} x ` +
`${image.naturalHeight} pixels<br>`;
output.innerHTML += `Displayed size: ${image.width} x ` +
`${image.height} pixels`;
});
The JavaScript code simply dumps the natural and as-displayed sizes into the <div>
with the class output
. This is done in response to the window's load
event handler, in order to ensure that the image is available before attempting to examine its width and height.
Result
Specifications
Specification | Status | Comment |
---|---|---|
HTML Living StandardThe definition of 'HTMLImageElement.naturalWidth' in that specification. | Living Standard |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
naturalWidth
|
Chrome
Full support 1 |
Edge
Full support 12 |
Firefox
Full support Yes |
IE
Full support 9 |
Opera
Full support Yes |
Safari
Full support Yes |
WebView Android
Full support Yes |
Chrome Android
Full support Yes |
Firefox Android
Full support Yes |
Opera Android
? |
Safari iOS
Full support Yes |
Samsung Internet Android
Full support Yes |
Legend
- Full support
- Full support
- Compatibility unknown
- Compatibility unknown
HTMLImageElement.naturalWidth by Mozilla Contributors is licensed under CC-BY-SA 2.5.