w3.org Spec Intrinsic Sizing In CSS
Intrinsic sizing
determines sizes based on the contents of an element, without regard for its context.
width: min-content | max-content;
/* Keyword values */
contain-intrinsic-width: none;
/* <length> values */
contain-intrinsic-size: 1000px;
contain-intrinsic-size: 10rem;
/* width | height */
contain-intrinsic-size: 1000px 1.5em;
/* auto <length> */
contain-intrinsic-size: auto 300px;
/* auto width | auto height */
contain-intrinsic-size: auto 300px auto 4rem;
/* Global values */
contain-intrinsic-size: inherit;
contain-intrinsic-size: initial;
contain-intrinsic-size: revert;
contain-intrinsic-size: revert-layer;
contain-intrinsic-size: unset;
contain-intrinsic-width
contain-intrinsic-height