The vertical position of the item on the canvas in pixels.
<button> <caption> <checkboxes> <clock> <dropdown> <image> <likert> <listbox> <openended> <picture> <radiobuttons> <shape> <slider> <slidertrial> <text> <textbox> <video>
Use the xpct property to get the position as a percentage of the canvas height.
The following displays the value of ypx in a text stimulus:
<text sometext>
/ items= ("ypx = <% text.foo.ypx %>")
</text>