ineClass</code></a>
and <a href="manual.html#removeLineClass"><code>removeLineClass</code></a>,
which allow more modular control over the classes attached to a line.</p>

<pre data-lang="javascript">
var marked = cm.addLineClass(10, "background", "highlighted-line");
setTimeout(function() {
  cm.removeLineClass(marked, "background", "highlighted-line");
});
</pre>
</section>
<section id=positions>
  <h2>Position properties</h2>

<p>All methods that take or return objects that represent screen
positions now 