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In https://drafts.csswg.org/css-transforms/#interpolation-of-decomposed-3d-matrix-values, it says `theta = acos(dot)`. However, `dot` is never defined here. It probably should be `product` h/t https://github.com/canaltinova for finding this.
Migrated to https://github.com/w3c/csswg-drafts/issues/911