t id="indexOf" class="callable inherited">
          <span class="name"><a href="dart-collection/ListMixin/indexOf.html">indexOf</a></span><span class="signature">(<wbr><span class="parameter" id="indexOf-param-element"><span class="type-annotation"><a href="dart-core/Object-class.html">Object</a></span> <span class="parameter-name">element</span>, [</span> <span class="parameter" id="indexOf-param-start"><span class="type-annotation"><a href="dart-core/int-class.html">int</a></span> <span class="parameter-