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Setting up a new theme, I realize WordPress is outputting only one value in sizes.
for example: <img src="https://site.dev/img-1-324x324.jpg" loading="lazy" srcset="https://site.dev/img1-324x324.jpg 324w, https://site.dev/img1-150x150.jpg 150w, https://site.dev/img1-100x100.jpg 100w" sizes="(max-width: 324px) 100vw, 324px" width="324" height="324"> Not a big deal with these tiny images but in my theme images can take up almost the entire screen and i want them to load the relevant size.

When I use 'full' as in wp_get_attachment_image($id,full,false,$attr);
id get's heavy like:
<img src="https://site.dev/img1.jpg" loading="lazy" srcset="https://site.dev/img1.jpg 789w, https://site.dev/img1-247x300.jpg 247w, https://site.dev/img1-768x934.jpg 768w, https://site.dev/img1-416x506.jpg 416w, https://site.dev/img1-49x60.jpg 49w, https://site.dev/img1-74x90.jpg 74w" sizes="(max-width: 789px) 100vw, 789px" width="789" height="960">

I guess the browser rightfully takes the big image since it is the only one mentioned in sizes attribute.

I tried checking the value for $attr just after calling wp_get_attachment_image, and it is an empty array.

How do get the sizes attributes for WordPress to use?

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