Hack to size the container of a background image

An element that contains a background image cannot have its height and width derived from that background image. An element can have a height and width that is determined by the size of a child element however. Combine the two to ensure that the container of the background image has the height and width of the image itself.

<div style="background-image: url('http://example.com/image.png')">
    <img src="http://example.com/image.png">
</div>

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