Text Overflow Vertical Mode controls whether lines of text can draw outside of the bounds of the Text object vertically.
Spill enables the drawing of text lines outside of the vertical bounds of a Text instance. The following image shows a Text instance with wrapped text using Spill.
Truncate Line removes lines which fall outside of the bounds of the Text instance. The following animation shows lines of text truncating in response to changing the Text instance's height.
Note that if the Text instance's height becomes too small then all text disappears.