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If a value type does not define a specific procedure for addition or is defined as not additive, its addition operation is simply Vresult = Va.
Because addition is not commutative, and I expect Va is the underlying value, and Vb is the value to combine (i.e. the keyframe effect value), per the-effect-value-of-a-keyframe-animation-effect.
Get the composited value for "from": 100px + 100px = 200px.
Get the composited value for "to": 100px + auto = 100px, because discrete is not additive and Vresult = Va.
Therefore, this becomes an interpolation from 200px to 100px. However, this mismatches the wpt and the current behavior of all the browsers. The interpolation is something like from 200px to auto:
We use discrete for <line-names>, and we use the keyframe value (i.e. Vb) as the composited <line-names> values in this test case.
I guess I may miss something. However, per these examples and current behaviors of all browsers, should we change the spec words for non-additive in [css-values-4] to use Vresult = Vb or effect value? Or perhaps we have similar definition in [web-animations]?