[csswg-drafts] [css-sizing-4] Give examples for how the aspect-ratio affects the {min,max}-content size of a box. (#4637)

bfgeek has just created a new issue for https://github.com/w3c/csswg-drafts:

== [css-sizing-4] Give examples for how the aspect-ratio affects the {min,max}-content size of a box. ==
https://drafts.csswg.org/css-sizing-4/#ratios

E.g.
```
<div style="height: 100px; aspect-ratio: 1/1;">
  <span style="display: inline-block; width: 50px;"></span>
  <span style="display: inline-block; width: 150px;"></span>
</div>
```

And how this affects other things like the flex algorithm.

Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/4637 using your GitHub account