ckgroundPage : unit <span>&#45;&gt;</span> <span><span><a href="../../../ezjs-min/Js_min/index.html#type-window">Js_min.window</a> <a href="../../../ezjs-min/Js_min/index.html">Js_min</a>.t</span> Lwt.t</span></code></dt><dt class="spec value" id="val-openOptionsPage"><a href="#val-openOptionsPage" class="anchor"></a><code><span class="keyword">val</span> openOptionsPage : <span>?&#8288;callback:<span>(unit <span>&#45;&gt;</span> <span class="type-var">'a</span>)</span></span> <span>&#45;&gt;</span> unit <s