Removes all of the element's items.
<html>
<item>
<list>
<picture>
<port>
<sound>
<text>
<video>
<xid>
None.
The following clears all of the items from a text stimulus:
<trial sometrial>
/ ontrialend= [text.sometext.clearitems();]
</trial>
The following clears all of the items from the selection pool of a list:
<trial sometrial>
/ ontrialend= [list.mylist.clearitems();]
</trial>