dart">HttpRequestEventTarget</code>.
            </dd>
            <dt id="onLoadStart" class="property">
                <span class="top-level-variable-type">Stream&lt;<a href="dart-html/ProgressEvent-class.html">ProgressEvent</a>&gt;</span>
                <span class="name ">onLoadStart</span>
            </dt>
            <dd>
                <div class="readable-writable">
        read-only, <span class="is-inherited">inherited</span>
    </div>
    Stream of <code class="prettyprint lang-dart">loadst