The spec wants @property to be invalid when syntax is not * and initial-value is a computationally dependent value.
In current version of Chrome and FF, @property is valid with syntax: "smaller | <length-percentage>" and initial-value: smaller, whereas the computed value of font-size: smaller depends on "the computed font-size of the parent element [...]". Of course, smaller can compute to itself (in lowercase) in other contexts, so they may have intentionally left it valid.
I am not sure why a computationally dependent initial-value should make @property invalid. This is not explained, so I am struggling to determine other cases of computationally dependent values than <length>s.
The spec wants
@propertyto be invalid whensyntaxis not*andinitial-valueis a computationally dependent value.In current version of Chrome and FF,
@propertyis valid withsyntax: "smaller | <length-percentage>"andinitial-value: smaller, whereas the computed value offont-size: smallerdepends on "the computedfont-sizeof the parent element [...]". Of course,smallercan compute to itself (in lowercase) in other contexts, so they may have intentionally left it valid.I am not sure why a computationally dependent
initial-valueshould make@propertyinvalid. This is not explained, so I am struggling to determine other cases of computationally dependent values than<length>s.