The value (0 to 255) of the blue component of a text's background color.
The following displays the value of textbgcolorblue in a text stimulus:
<text sometext>
/ items= ("textbgcolorblue = <% text.circle.textbgcolorblue %>")
</text>
The following displays the value of textbgcolorblue in an instruction page:
<page somepage>
textbgcolorblue = <% text.circle.textbgcolorblue %>
</page>