         </div>
          <!--
            The containing block of this target is the multicol container.
          -->
          <div class="target"
               data-offset-x=10 data-offset-y=20
               data-expected-width=40 data-expected-height=20></div>
        </div>
        <!--
          The containing block of this target is in the multicol,
          but outside of the spanner.
          This should not find the anchor, because the containing block of the
          spanner is the multicol