white space
noun
1 Typography the blank areas of a page or other piece of printed matter, as margins, gutters between columns, etc., regarded collectively as an element of layout and design.
2 Computing (frequently as one word) blank space in electronic text produced by one or more keyed characters, as spaces, tabs, line-breaks, etc.; often attributive as whitespace character.
Origin
Late 19th century; earliest use found in Clothier & Furnisher.