<tr><th><dfn>Duration</dfn></th><td>The target duration of the region, expressed using the
primary transport clock's mode</td></tr>
<tr><th><dfn>Percent</dfn></th><td>The target duration of the region, expressed as a percentage
<tr><th><dfn>Duration</dfn></th><td>The target duration of the region, expressed using the
primary transport clock's mode</td></tr>
<tr><th><dfn>Percent</dfn></th><td>The target duration of the region, expressed as a percentage