<span>Check the console</span>
        <div id="toolbar" tabindex="0">
                 <a tabIndex="0" id="foo" >foo</a>
        </div>
        <script>
            $(document).ready(function () {
                var toolbar = $('#toolbar');
                toolbar.on("focusin", function (ev) {
                        var element = $(this).find("a");
                        if (element.length) {
                            element[0].focus();
                            console.log(document.activeElement)
                        }
                    })
                toolbar[0].focus();
                //toolbar[0].focus(); this works
                console.log('With 3.3.1 here we expect to see "foo":', document.activeElement.id);
            });
        </script>