ype">double</span>
                <a href="polymer_app_layout.behaviors/PerformanceResourceTiming/domainLookupStart.html">domainLookupStart</a>
            </dt>
            <dd>
                <div class="readable-writable">
        read-only
    </div>
    
            </dd>
            <dt id="duration" class="property">
                <span class="top-level-variable-type">double</span>
                <span class="name ">duration</span>
            </dt>
            <dd>
                <div class="r