The vertical position of the item on the canvase.
<button> <caption> <checkboxes> <clock> <dropdown> <image> <likert> <listbox> <openended> <picture> <radiobuttons> <shape> <slider> <slidertrial> <text> <textbox> <video>
The vposition can be specified in percentages, pixels, or points.
The following displays the value of vposition in a text stimulus:
<text sometext>
/ items= ("vposition = <% text.foo.vposition %>")
</text>