span>, </span> <span class="parameter" id="-param-fork"><span class="type-annotation"><a href="dart-async/ForkHandler.html">ForkHandler</a></span> <span class="parameter-name">fork</span></span> })</span>
        </dt>
        <dd>
          Creates a specification with the provided handlers.
          <div class="constructor-modifier features">const</div>
          <div class="constructor-modifier features">factory</div>
        </dd>
        <dt id="ZoneSpecification.from" class="callable">
          <spa