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HTMLSourceElement: height property - Web APIs | MDN

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Value

A non-negative number indicating the height of the image resource in CSS pixels.

Examples

html
<picture id="img">
  <source
    srcset="landscape.png"
    media="(width >= 1000px)"
    width="1000"
    height="400" />
  <source
    srcset="square.png"
    media="(width >= 800px)"
    width="800"
    height="800" />
  <source
    srcset="portrait.png"
    media="(width >= 600px)"
    width="600"
    height="800" />
  <img
    src="fallback.png"
    alt="Image used when the browser does not support the sources"
    width="500"
    height="400" />
</picture>

js
const img = document.getElementById("img");
const sources = img.querySelectorAll("source");
console.log(Array.from(sources).map((el) => el.height)); // Output: [400, 800, 800]