https://html.spec.whatwg.org/commit-snapshots/86a37fed1dc78035c84e2c87b2db44cf5634371d/#images-processing-model

To determine the density-corrected intrinsic width and height of an img element img:​

1. Let dim be img's current request's preferred density-corrected dimensions.

2. If dim is null, set dim to img's intrinsic dimensions.

3. Set dim's width to dim's width divided by img's current request's current pixel density.

4. Set dim's height to dim's height divided by img's current request's current pixel density.

5. Return dim.

Before the image is prepared for presentation, dim will be null. Should steps 3 and 4 be skipped in that case?

From #8175 (comment)