d track to switch to one of lower quality.</dd>
<dd><code>minDurationToRetainAfterDiscardMs</code> - When switching to a video track of higher quality, the
     selection may indicate that media already buffered at the lower quality can be discarded to
     speed up the switch. This is the minimum duration of media that must be retained at the
     lower quality. It must be at least <code>minDurationForQualityIncreaseMs</code>.</dd>
<dd><code>maxWidthToDiscard</code> - The maximum video width that the selec