I saw this happen to a streamer so I tested it and found it to be true.
<div style="width:100%;height:0px;position:relative;padding-bottom:56.250%;"><iframe src="https://streamable.com/e/22rq2j" frameborder="0" width="100%" height="100%" allowfullscreen style="width:100%;height:100%;position:absolute;left:0px;top:0px;overflow:hidden;"></iframe></div>