Specifies the width of a metadata field caption, in percent.
Returns the width of the current metadata field caption in percent.
Used as script:
<$if isInfo$>
<$captionFieldWidth="30%"$>
<$captionEntryWidth="70%"$>
<$elseif isEditMode$>
<$captionFieldWidth="20%"$>
<$captionEntryWidth="80%"$>
<$endif$>