HTMLSourceElement: srcset property

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since March 2017.

The srcset property of the HTMLSourceElement interface is a string containing a comma-separated list of candidate images.

Each candidate image includes the URL of an image resource to use as the source for the element and optionally a descriptor indicating the circumstances in which the image should be used. The descriptor is either a number followed by 'w', indicating the element width, or a number followed by 'x', indicating the device pixel density.

It reflects the srcset attribute of the <source> element nested in a <picture> element. It has no meaning and is ignored when it is nested in an <audio> or <video> element, which use the src attribute instead.

Value

A string.

Examples

html
<picture>
  <source
    id="el"
    srcset="smile.png, smile-1.5x.png 1.5x, smile-2x.png 2x"
    type="image/png" />
</picture>

js
const el = document.getElementById("el");
console.log(el.srcset); // Output: "smile.png, smile-1.5x.png 1.5x, smile-large 800w"
el.srcset = "smile.png, smile-med.png 600w, smile-large.png 800w"; // Updates the srcset value