attribute must, on getting, return the <a href=#earliest-possible-position>earliest possible
position</a>, expressed in seconds.</p>
<p>When the <a href=#earliest-possible-position>earliest possible position</a> changes, then:
if the <a href=#current-playback-position>current playback position</a> is before the
<a href=#earliest-possible-position>earliest possible position</a>, the user agent must <a href=#dom-media-seek title=dom-media-seek>seek</a> to the <a href=#earliest-possible-position>earliest possible
position</a>.</p>
position</a>; otherwise, if the user agent has not fired a <code title=event-timeupdate><a href=#event-timeupdate>timeupdate</a></code> event at the element in
the past 15 to 250ms, then the user agent must <a href=#queue-a-task>queue a
task</a> to <a href=#fire-a-simple-event>fire a simple event</a> called <code title=event-timeupdate><a href=#event-timeupdate>timeupdate</a></code> at the element.</p>