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<h2 class="section" id="sec157">B.13  Lengths, Spaces and Boxes</h2>
<ul>
<li><a href="manual035.html#sec158">Length</a>
</li><li><a href="manual035.html#sec159">Space</a>
</li><li><a href="manual035.html#sec160">Boxes</a>
</li></ul>
<h3 class="subsection" id="sec158">B.13.1  Length</h3>
<p>All length commands are ignored, things go smoothly when L<sup>A</sup>T<sub>E</sub>X syntax is
used (using the <code>\newlength</code>, <code>\setlength</code>, etc. commands,
which are null macros).
Of course, if lengths are really important to the document, rendering
will be poor.</p><p>Note that T<sub>E</sub>X length syntax is not at all recognised. As a
consequence, writing things like <code>\textwidth=10cm</code> will clobber
the output.
Users can correct such misbehaviour by adopting L<sup>A</sup>T<sub>E</sub>X syntax, here
they should write
<code>\setlength{\textwidth}{10cm}</code>.</p>
<h3 class="subsection" id="sec159">B.13.2  Space</h3>
<p>
The <code>\hspace</code>, <code>\vspace</code> and <code>\addvspace</code> spacing
commands and their starred versions recognise positive explicit length
arguments. Such arguments get converted to a number of non-breaking
spaces or line breaks.
Basically, the value of <code>1em</code> or <code>1ex</code> is one space or one
line-break. For other length units, a simple conversion based upon a
10pt font is used.</p><p>H<span class="c015"><sup>E</sup></span>V<span class="c015"><sup>E</sup></span>A cannot interpret more complicated length arguments
or perform negative spacing.
In these situations, a warning is issued and no output is done.</p><p>Spacing commands without arguments are recognised.
The <code>\enspace</code>, <code>\quad</code> and <code>\qquad</code> commands output
one, two and four non-breaking spaces, while the <code>\smallskip</code>,
<code>\medskip</code> and <code>\bigskip</code> output one, one, and two line
breaks.</p><p>Stretchable lengths do not exist, thus the <code>\hfill</code> and
<code>\vfill</code> macros are undefined.</p>
<h3 class="subsection" id="sec160">B.13.3  Boxes</h3>
<p>Box contents is typeset in text mode (<em>i.e.</em> non-math and non-display
mode).
Both L<sup>A</sup>T<sub>E</sub>X boxing commands <code>\mbox</code> and <code>\makebox</code>
commands exist.
However <code>\makebox</code> generates a specific warning, since H<span class="c015"><sup>E</sup></span>V<span class="c015"><sup>E</sup></span>A
ignore the length and positioning instructions given as optional
argument.</p><p>Similarly, the boxing with frame <code>\fbox</code> and <code>\framebox</code>
commands are recognised and
<code>\framebox</code> issues a warning.
When in display mode, <code>\fbox</code> frames its argument by
enclosing it in a
table with borders. Otherwise, <code>\fbox</code> calls the <code>\textfbox</code>
command, which issues a warning and typesets its argument
inside a <code>\mbox</code> (and thus no frame is drawn).
Users can alter the behaviour of <code>\fbox</code> in non-display mode by
redefining <code>\textfbox</code>.</p><p>Boxes can be saved for latter usage by storing them in <em>bins</em>.
New bins are defined by <code>\newsavebox{</code><span class="c018">cmd</span><code>}</code>.</p><p>Then some text can be saved into <span class="c018">cmd</span> by
<code>\sbox{</code><span class="c018">cmd</span><code>}{</code><span class="c018">text</span><code>}</code> or
<code>\begin{lrbox}{</code><span class="c018">cmd</span><code>}</code> <span class="c018">text</span> <code>\end{lrbox}</code>.
The text is translated to html, as if it was inside a <code>\mbox</code>
and the resulting output is stored.
It is retrieved (and outputted) by the command
<code>\usebox{</code><span class="c018">cmd</span><code>}</code>.
The <code>\savebox</code> command reduces to <code>\sbox</code>, ignoring its
optional arguments.</p><p>The <code>\rule</code> commands translate to a html horizontal rule
(<code><HR></code>) regardless of its arguments.</p><p>All other box-related commands do not exist.</p>
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