labelWidget label; interactive widgets also use it for ID generation. A ## suffix can distinguish IDs without displaying the suffix.
sizeVertical slider frame width and height in pixels.
vMutable widget value in element [0]; edits are written back into the supplied array. Pass Int32Array storage, not a JS scalar; native access uses the supplied backing memory.
v_minLower end of the value range; for drag widgets v_min >= v_max disables ordinary bounds.
v_maxUpper end of the value range; slider flags determine whether manual input is clamped.
True if the widget changed the supplied value; false if it remained unchanged.
Edit an integer value with a vertical slider.