https://drafts.csswg.org/css-color-hdr/#the-dynamic-range-limit-property says that dynamic-range-limit is not inherited, and the explainer says
A non-goal of this proposal is to provide a mechanism through which a maximum brightness of HDR content can be enforced on child elements of a given element.
but the example uses
body { dynamic-range-limit: standard; }
which seems like it would only work if the property is inherited or it applies to all colors in children.