d>
                <div class="readable-writable">
        read-only
    </div>
    Event listeners to be notified every time the <code class="prettyprint lang-dart">HttpRequest</code>
object's <code class="prettyprint lang-dart">readyState</code> changes values.
            </dd>
            <dt id="onTimeout" class="property">
                <span class="top-level-variable-type">Stream&lt;<a href="dart-html/ProgressEvent-class.html">ProgressEvent</a>&gt;</span>
                <span class="name ">onTimeo