TabFilling
is an option for character selections that specifies how a 
character is represented on the screen.
TabFilling
This function has not been fully integrated into the long-term Wolfram Language, and is subject to change.
is an option for character selections that specifies how a 
character is represented on the screen.
Details
- TabFilling can be set to any character. With the default setting TabFilling->None,
characters appear as whitespace. - If TabFilling is set to a string, such as ".", the character or characters in the string will be repeated as necessary to fill the available space.
- Other common settings are Underline and GrayUnderline.
Wolfram Research (1999), TabFilling, Wolfram Language function, https://reference.wolfram.com/language/ref/TabFilling.html.
Text
Wolfram Research (1999), TabFilling, Wolfram Language function, https://reference.wolfram.com/language/ref/TabFilling.html.
CMS
Wolfram Language. 1999. "TabFilling." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/TabFilling.html.
APA
Wolfram Language. (1999). TabFilling. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/TabFilling.html