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For instance, given: animation-delay: -0.5s; animation-duration: 3s; Implementations agree that animationStart reports an elapsedTime of 0.5s while animationEnd's elapsedTime is 3s even though the effective duration is 2.5s i.e. elapsedTime really reports the position of a given frame on the animation's timeline before delay is applied. The spec needs to cover this.
Covered by the spec in 5.1.2; actually not a bug.