TIL - how height:auto works

Today I learned a bit more on how height:auto works. Let's say you have a box that has implicit height & width set to 250px. Inside this box you place 1px by 1px image. You give image height: auto. What is happening? This image is taking whole 250px height!

1x1 px box
1x1 px box

But you do the same with image 250px by 1px (250px width by 1px height) - image is taking only 1px height.

250x250 px box
250x250px box

So if you want your image to take only 1px with height:auto make sure that such image has full width of parent.

You can see example in this codepen.

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