3 Running the apparatus off the edge of the page is easy to do. In defining the widths of individual columns, use pixels rather than percents. It is more likely to look good on different-sized screens. 4 Use pixels to calculate the column-widths, too. Keep the Apparatus close, but not too close, to the text.
Necessary width depends on the length of the longest line, which is a matter of chance.
5 Use a symbol to show where each line of apparatus ends. Otherwise, ambiguity is possible, and a user may scroll over to look for something that is not there. If an individual word is broken off at the edge of the screen, there is obviously more to see. But occasionally one line of apparatus will have two or more separate entries and the edge of the screen will happen to fall in the space between them, so that the visible part of the line of apparatus appears to be complete when it is not. This would also be appropriate for stage directions in dramatic texts.