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<h3 class="section" id="Text-1">5.1 Text</h3>
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<p><abbr class="acronym">AT&T</abbr> <code class="code">troff</code> was designed to take input as it would be
composed on a typewriter, including the teletypewriters used as early
computer terminals, and relieve the user drafting a document of concern
with details like line length, hyphenation breaking, and the achievement
of straight margins. Early in its development, the program gained the
ability to prepare output for a phototypesetter; a document could then
be prepared for output to either a teletypewriter, a phototypesetter, or
both. GNU <code class="code">troff</code> continues this tradition of permitting an author
to compose a single master version of a document which can then be
rendered for a variety of output formats or devices.
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<p><code class="code">roff</code> input files contain text interspersed with instructions to
control the formatter. Even in the absence of such instructions, GNU
<code class="code">troff</code> still processes its input in several ways, by filling,
hyphenating, breaking, and adjusting it, and supplementing it with
inter-sentence space.
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