le Sheets Level 2 Revision 1 (CSS 2.1) Specification". 7 June 2011. 16.6. pre-wrap: This value prevents user agents from collapsing sequences of white space.↑ Jury 2009. p. 57.↑ American Medical Association 2007. p. 917.↑ Dowding 1995.↑ Shushan and Wright 1989. p. 34.↑ Craig 2006. p. 90; Spiekermann and Ginger 1993, p. 123.↑ Felici 2003. pp. 80–81.↑ Jury 2004. p. 92.↑ De Vinne 1901; University of Chicago Press 1911; Hart 1893.↑ Garner, Newman and Jackson 2006; "So I ask you (authors): space twice after every period," Nina K. Hoffman, "Typesetters Blues," in Rusch and Smith 1990, p. 113.↑ For example, the 15th Edition of the Chicago Manual of Style states that "A single character space, not two spaces, should be left after periods at the ends of sentences (both in manuscript and in final, published form) and after colons. University of Chicago Press 2003 Chicago Manual of Style. p. 61.↑ University of Chicago Press 1969 Manual of Style (commonly referred to as "Chic