 Technological advances began affecting sentence spacing methods . In 1941 , IBM introduced the Executive , a typewriter capable of proportional spacing — which had been used in professional typesetting for hundreds of years . This innovation broke the hold that the monospaced font had on the typewriter — reducing the severity of its mechanical limitations . By the 1960s , electronic phototypesetting systems ignored runs of white space in text . This was also true of the World Wide Web , as HTML normally ignores additional spacing , although in 2011 the CSS 2 @.@ 1 standard officially added an option that can preserve additional spaces . In the 1980s , desktop publishing software provided the average writer with more advanced formatting tools . By the late 20th century , literature on the written word had begun to adjust its guidance on sentence spacing . 
 Technological advances began affecting sentence spacing methods . In 1941 , IBM introduced the Executive , a typewriter capable of proportional spacing — which <a href='been_done' title='1'><mark>had</mark></a> been used in professional typesetting for hundreds of years . This innovation broke the hold <a href='null_relcl' title='2'><mark>that</mark></a>the monospaced font had on the typewriter — reducing the severity of its mechanical limitations . By the 1960s , electronic phototypesetting systems ignored runs of white space in text . This was also true of the World Wide Web , as HTML normally <a href='uninflect' title='3'><mark>ignores</mark></a> additional spacing , although in 2011 the CSS 2 @.@ 1 standard officially added an option <a href='null_relcl' title='4'><mark>that</mark></a>can preserve additional spaces . In the 1980s , desktop publishing software provided the average writer with more advanced formatting tools . By the late 20th century , literature on the written word <a href='been_done' title='5'><mark>had</mark></a> begun to adjust its guidance on sentence spacing . 
Technological advances began affecting sentence spacing methods . In 1941 , IBM introduced the Executive , a typewriter capable of proportional spacing — which done been used in professional typesetting for hundreds of years . This innovation broke the hold da monospaced font had on the typewriter — reducing the severity of its mechanical limitations . By the 1960s , electronic phototypesetting systems ignored runs of white space in text . This was also tru of the World Wide Web , as HTML normally ignore additional spacing , although in 2011 the CSS 2 @.@ 1 standard officially added an option can preserve additional spaces . In tda1980s , desktop publishing software provided the average writer with more advanced formatting tools . By the late 20th century , literature on thdaritten word done begun to adjust its guidance on sentence spacing .