Dojo dijit / focus不会使键盘出现在Firefox和Edge on Surface上

Question

当输入字段通过java脚本调用获得焦点时，我想弹出触摸键盘。下面是我的示例代码，它适用于Chrome浏览器，但Firefox和Edge却没有。

http://jsfiddle.net/BUX4b/75

<input id="foo" type="text"><br><br>
<button id="newActButton">New Act Button</button>

require(["dojo/on", "dojo/dom", "dijit/focus", "dojo/domReady!"],
    function(on, dom, focusUtil) {
        var newActButton = dom.byId("newActButton");
        on(newActButton, "click", function(){   
            focusUtil.focus(dom.byId("foo"));        
        });
    });