onMSVideoFrameStepCompleted

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非标
此特征是非标准的，且不在标准轨道中。不要在面向 Web 的生产站点中使用它：它不适用于每个用户。实现之间可能存在大的不兼容性，且行为将来可能改变。

onMSVideoFrameStepCompleted is an event which occurs when the video frame has been stepped forward or backward one frame.

This proprietary property is specific to Internet Explorer and Microsoft Edge.

值	描述
Event Property	object.onMSVideoFrameStepCompleted = handler;
attachEvent Method	object.attachEvent("onMSVideoFrameStepCompleted", handler)
addEventListener Method	object.addEventListener("", handler, useCapture)