Non-standard: This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
msIsLayoutOptimalForPlayback is a read-only property which indicates whether the video can be rendered more efficiently.
This proprietary property is specific to Internet Explorer and Microsoft Edge.
Boolean value set to true indicates that video is being rendered optimally (better performance and using less battery power). If false, improvements can be made to optimize performance.
For msIsLayoutOptimalForPlayback to be true, avoid the following:
You can listen to the onMSVideoOptimalLayoutChanged event to be notified when the msIsLayoutOptimalForPlayback property changes.
*To enable Stereo 3D playback, msIsLayoutOptimalForPlayback must be true.
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https://developer.mozilla.org/en-US/docs/Web/API/HTMLVideoElement/msIsLayoutOptimalForPlayback