ates that there are other examples of standard single word spaces used for sentence spacing in this period.↑ Dodd 2006. p. 73; Mergenthaler Linotype 1940.↑ One or two spaces after a period? How about three?↑ Jury 2009. p. 58. This primarily refers to the United States and Great Britain.↑ Imprimerie nationale 1993.↑ Osgood 1919↑ Adams, et al. 1996. p. 24. Adams, Faux, and Rieber say, "For most composition, the em quad is used to indent the first line of a paragraph, the en quad is used to separate sentences, and the 3-em space is placed between words." An en is half an em and a 3-em space is a third of an em, so the space between sentences would be 1.5 times the space between words.↑ Felici 2009; University of Chicago Press 2009; Williams 2003. p. 14.↑ 28.0 28.1 Wershler-Henry 2005. pp. 254–255.↑ Lupton 2004. p. 165. HTML normally ignores all additional horizontal spacing between text.↑ 30.0 30.1 How many spaces at the end of a sentence? One or two?↑ "Cascading Sty