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<h4 class="subsection" id="Blank-Line-Traps-1">5.28.3 Blank Line Traps</h4>
<a class="index-entry-id" id="index-blank-line-traps"></a>
<a class="index-entry-id" id="index-traps_002c-blank-line"></a>
<dl class="first-deffn">
<dt class="deffn" id="index-_002eblm"><span class="category-def">Request: </span><span><strong class="def-name"><code class="t">.blm</code></strong> <var class="def-var-arguments">[<span class="r"><i class="slanted">name</i></span>]</var><a class="copiable-link" href='#index-_002eblm'> ¶</a></span></dt>
<dd><a class="index-entry-id" id="index-blm"></a>
<a class="index-entry-id" id="index-blank-line-macro-_0028blm_0029-2"></a>
<p>Set a blank line trap, calling the macro <var class="var">name</var> when GNU
<code class="code">troff</code> encounters a blank line in an input file, instead of the
usual behavior (see <a class="pxref" href="Breaking.html">Breaking</a>). A line consisting only of spaces is
also treated as blank and subject to this trap. If no argument is
supplied, the default blank line behavior is (re-)established.
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