``` the selectedLine the selectedLine of listField the selectedLine of popupButton ``` Values returned: * for the selectedLine, a line expression that indicates the line of a field or the Message box in which a range of characters is currently highlighted * for the selectedLine of listField, a line expression that indicates the lines of a list field in which the characters are currently highlighted * for the selectedLine of popupButton, a line expression that evaluates to the line number in a popup button’s contents indicating the current selection If nothing is selected, the selectedLine returns empty. If a field isn't currently a list field but it was in the past, and a selection had been made when it was a list field, the selectedLine returns the most recent selection. The line expression returned has the following forms: ``` line i of {card|bkgnd} field n line i of {card|bkgnd} button n line x to y of {card|bkgnd} field n ``` where i is the line number and n is the number of a popup button or a field, and x to y is a range of lines in a list field.