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The <code>||</code> here means that the attribute value is missing, please do
not confuse that with <code>||</code> inside the autosplit node itself,
where this introduces a "linebreak".
</p>

<p>
You can also set an attribute for all parts, or only for specific parts:
</p>

<ul>
  <li><code>[ A|B ] { class: |legend; }</code>
      will put B into class 'legend' and leave the class of A alone
  <li><code>[ A|B ] { class: legend|; }</code>
      will put A into class 'legend' and leave the class of B alone
  <li><code>[ A|B ] { class: legend; }</code>
      will put A <b>and</b> B into class 'legend'
</ul>

<p>
Here are the rules from above in an example showing their effect:
</p>

<pre class="graphtext">
node.1 { border: dotted; }
node.2 { border: dashed; }
node.3 { border: dot-dash; }