How to add a width attribute to a responsive image with srcset?

When using a responsive image with srcset the width and height attributes are not available in twig. Both of them are NULL When an image is uploaded that is too small images are stretched or blown up as described in this post: Responsive Images, The sizes Attribute, and Unexpected Image Sizes

Being able to set a with equal to the pixelsize of the image would solve this issue. How can I make these attributes available for twig?

This article was republished from its original source.
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How to add a width attribute to a responsive image with srcset?

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