Following up on #5032 (comment) and https://lists.w3.org/Archives/Public/www-style/2020Jul/0004.html

The min-content and max-content sizes are defined to take aspect-ratio into account (see above discussion for why). However, in our specs at least, we probably need a separate set of terms for talking about the content-based size ignoring aspect ratio. This issue is for naming this concept, auditing our specs to use it, and maybe also deciding whether not we want a separate set of keywords to represent it explicitly in our sizing properties.

Whatever that term is, it's probably good to match it with the middle part of what is currently contain-intrinsic-size, also.

Using intrinsic is a bit tricky since we've been using intrinsic to refer to the min-content/max-content sizes for awhile. Also it's hard to pronounce/spell, so not a great candidate for author-facing APIs. Another suggestion was natural size, to match the DOM APIs on images. Other suggestions welcome, this is a bikeshedding issue.