calc() as CSS unit value

Method of allowing calculated values for length units, i.e. `width: calc(100% - 3em)`

javascript built-in: array: [symbol.species]

javascript built-in: intl: segments: containing

javascript built-in: iterator: @@dispose

javascript built-in: map: [symbol.iterator]

javascript built-in: map: [symbol.species]

javascript built-in: regexp: [symbol.species]

javascript built-in: set: [symbol.iterator]

javascript built-in: set: [symbol.species]

javascript built-in: typedarray: [symbol.iterator]

javascript built-in: typedarray: at

javascript built-in: typedarray: buffer

javascript built-in: typedarray: bytelength

javascript built-in: typedarray: byteoffset

javascript built-in: typedarray: copywithin

javascript built-in: typedarray: entries

javascript built-in: typedarray: every

javascript built-in: typedarray: fill

javascript built-in: typedarray: filter

javascript built-in: typedarray: find

javascript built-in: typedarray: findindex

javascript built-in: typedarray: findlast

javascript built-in: typedarray: findlastindex

javascript built-in: typedarray: foreach

javascript built-in: typedarray: from

javascript built-in: typedarray: includes

javascript built-in: typedarray: indexof

javascript built-in: typedarray: join

javascript built-in: typedarray: keys

javascript built-in: typedarray: lastindexof

javascript built-in: typedarray: length

javascript built-in: typedarray: map

javascript built-in: typedarray: of

javascript built-in: typedarray: reduce

javascript built-in: typedarray: reduceright

javascript built-in: typedarray: reverse

javascript built-in: typedarray: set

javascript built-in: typedarray: slice

javascript built-in: typedarray: some

javascript built-in: typedarray: sort

javascript built-in: typedarray: subarray

javascript built-in: typedarray: tolocalestring

javascript built-in: typedarray: toreversed

javascript built-in: typedarray: tosorted

javascript built-in: typedarray: tostring

javascript built-in: typedarray: values

javascript built-in: typedarray: with

javascript operator: remainder (`%`)

javascript operator: remainder assignment (`x %= y`)

elements: mo: nonzero unitless values (e.g. 5 to mean 500%) for `lspace`, `maxsize`, `minsize` and `rspace` attributes