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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/HTMLImageElement/height below:

HTMLImageElement: height property - Web APIs

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The height property of the HTMLImageElement interface indicates the height 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 height of the image.

An integer value indicating the height of the image. The terms in which the height 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 height is expressed in CSS pixels.
• Otherwise, the image's height is represented using its natural (intrinsic) height, adjusted for the display density as indicated by naturalHeight.

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.

Specifically, for viewports up to 400px wide, the image is drawn at a width of 200px; otherwise, it's drawn at 300px.

<p>Image height: <span class="size">?</span>px (resize to update)</p>
<img
  src="/en-US/docs/Web/HTML/Reference/Elements/img/clock-demo-200px.png"
  alt="Clock"
  srcset="
    /en-US/docs/Web/HTML/Reference/Elements/img/clock-demo-200px.png 200w,
    /en-US/docs/Web/HTML/Reference/Elements/img/clock-demo-400px.png 400w
  "
  sizes="(max-width: 400px) 200px, 300px" />

The JavaScript code looks at the height to determine the height of the image given the width at which it's currently drawn.

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

const updateHeight = (event) => {
  output.innerText = clockImage.height;
};

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

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

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