Questions regarding eleventy-img config

I used your elventy.conifg.image.js in my project. I only had to change the object for the relative path, because the images are all in one assets folder. Thank you so much sharing this config. That helped me a lot.

Not sure if this is the right place for asking those questions. However, I’ll try it anyway:

• I was wondering if there is an explanation that the img tag used the width and height attributes from the original image size, which is 600px? It loads the smaller version, which is 300px.
• Maybe I understand the concept not good enough, but why does the img not uses the srcset and sizes attributes?

And a bonus question ;-) Would it make sense to use an example how to use all parameter possible within the shortcode in this starter? I found only one example without srcset and sizes.

Review the referenced elventy.conifg.image.js configuration and the starter's shortcode example, focusing on the img width, height, srcset, and sizes attributes. Document the behavior described in the questions and add an example covering the available shortcode parameters, if appropriate.