HTMLLinkElement: imageSizes property

The imageSizes property of the HTMLLinkElement interface indicates the size and conditions for the preloaded images defined by the imageSrcset property. It reflects the value of the <link> element's imagesizes attribute. This property can retrieve or set the imagesizes attribute value.

The <link> element's imagesizes attribute is the same as the <img> element's sizes attribute: a comma-separated source size list. Each source size includes a media condition, the size of the image as a <length>, or the keyword auto, which must come first. For more information about the syntax of the sizes attribute, see <img>.

The imagesrcset and imagesizes attributes are only relevant on <link> elements that have both a rel attribute set to preload and the as attribute set to image.

Value

A string composed of comma-separated source sizes, or the empty string "" if unspecified.

Examples

Given the following <link> element:

html

<link
  rel="preload"
  as="image"
  imagesrcset="narrow.png, medium.png 600w, wide.png 1200w"
  imagesizes="(width < 400px) 200px, (400px <= width < 600px) 75vw, 50vw" />

<pre id="log"></pre>

#log {
  padding: 0 0.25rem;
  font-size: 1.2em;
  line-height: 1.4;
}

const logElement = document.querySelector("#log");
function log(text) {
  logElement.innerText = `${logElement.innerText}${text}\n`;
  logElement.scrollTop = logElement.scrollHeight;
}

…we can retrieve and update the imagesizes attribute value with the imageSizes property:

const link = document.querySelector("link");
log(`Original: ${link.imageSizes}`);

// Change the value
link.imageSizes = "50vw";
log(`Updated: ${link.imageSizes}`);

Specifications

HTML

HTMLLinkElement: imageSizes property

Value

Examples

Specifications

See also