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A program called PerfectIt is an "MS Word add-in that helps professionals to proofread faster". The producer states that a feature was added to the most recent version of their program (as of August 2009), "to convert two spaces at the end of a sentence into one", but they have "never had any requests to convert one space into two". [3]
Word spaces, preceding or following punctuation, should be optically adjusted to appear to be of the same value as a standard word space. If a standard word space is inserted after a full point or a comma, then, optically, this produces a space of up to 50% wider than that of other word spaces within a line of type. This is because these ...
Standard word spaces were about one-third of an em space, but sentences were to be divided by a full em-space. With the arrival of the typewriter in the late 19th century, style guides for writers began diverging from printer's manuals, indicating that writers should double-space between sentences.
In many cases breaking up a word with a space would be inappropriate. Soft hyphens also creates word-break opportunities, but will add a hyphen rather than a space. In other words, a soft hyphen is a hyphen inserted into a word not otherwise hyphenated, to be displayed or typeset only if it falls at the end of a line of text.
A second common application of non-breaking spaces is in plain text file formats such as SGML, HTML, TeX and LaTeX, whose rendering engines are programmed to treat sequences of whitespace characters (space, newline, tab, form feed, etc.) as if they were a single character (but this behavior can be overridden).
Word spacing in typography is space between words, as contrasted with letter-spacing (space between letters of words) and sentence spacing (space between sentences). Typographers may modify the spacing of letters or words in a body of type to aid readability and copy fit, or for aesthetic effect.
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One widened space, typically one-and-a-third to slightly less than twice as wide as a word space. This spacing was sometimes used in typesetting before the 19th century. It has also been used in other non-typewriter typesetting systems such as the Linotype machine [18] and the TeX system. [19]