The contain-intrinsic-block-size CSS property allows elements with size containment to specify an explicit intrinsic inner block size.
object.style.containIntrinsicBlockSize = "value";
<'contain-intrinsic-block-size'> = none | <length> | auto <length>
The corresponding axis does not have an explicit intrinsic inner size.
The corresponding axis has an explicit intrinsic inner size of the specified <length>.
If the element has a last remembered size and is currently skipping its contents, its explicit intrinsic inner size is the last remembered size. Otherwise, its explicit intrinsic inner size is the specified <length>.