[css-color-hdr] Clarification on the grammar / spec text for `dynamic-range-limit-mix()`

[weinig]

CSS Color HDR specifies the grammar for dynamic-range-limit-mix() is:

dynamic-range-limit-mix() = dynamic-range-limit-mix( [ <ident> && <percentage [0,100]> ]#)

(https://drafts.csswg.org/css-color-hdr/#dynamic-range-limit-mix)

The examples however make it seems like the actual grammar should be something more like:

dynamic-range-limit-mix() = dynamic-range-limit-mix( [ <'dynamic-range-limit'> && <percentage [0,100]> ]#)

Perhaps with a more specific value multiplier than #? I don't see any examples in the spec or tests that less than two, so maybe #{2,}?

The spec text also seems incorrect. It currently states:

This function takes two dynamic-range-limit values, converts them internally to a value in stops above media white, and alters the display to the result of mixing them by the specified amount. The actual calculated result is not exposed.

The examples all show using three, so at least the "two" there should be updated.

cc (@svgeesus, @ccameron-chromium)

[css-meeting-bot]

The CSS Working Group just discussed [css-color-hdr] Clarification on the grammar / spec text for `dynamic-range-limit-mix()` .

The full IRC log of that discussion

<joshtumath> weinig: so it's just a clarification. whether the mix() function should take other mix() functions as the input?
<ccameron> q+
<joshtumath> ... and the other ?: could only 1 value in it make sense or should min be 2
<astearns> zakim, open queue
<Zakim> ok, astearns, the speaker queue is open
<joshtumath> ccameron: could have mix of mix. it seemed simplier to allow you to mix one value with itself, and have fewer rules
<joshtumath> weinig: it was more the grammar, maybe a typo. I can do a PR
<joshtumath> ChrisL: would be good