Removes textual elements containing only whitespace as content.
Removes (filters out) all the textual elements not containing any content at all.
None
minWidth: The minimum width to see if an element is at least a certain size for it to be taken into consideration as a candidate for removal
All whitespace textual elements are checked to see if their width is less than minWidth, then checked if they are overlapping with other text elements (a very common case), and then deleted.
Good. The module treats the most common cases, but its completeness is based on observation. New edge-cases might appear and will be interesting to treat in the future.