bs. Default is false.</dd>

  <dt id="option_tabMode"><code>tabMode (string)</code></dt>
  <dd>Determines what happens when the user presses the tab key.
  Must be one of the following:
    <dl>
      <dt><code>"classic" (the default)</code></dt>
      <dd>When nothing is selected, insert a tab. Otherwise,
      behave like the <code>"shift"</code> mode. (When shift is
      held, this behaves like the <code>"indent"</code> mode.)</dd>
      <dt><code>"shift"</code></dt>
      <dd>Indent all selected lines 