Function mouseEvent

test/jasmine/tests/updatemenus_test.js:893–896

(type, selection)

    // to detect the button elements in FF38 (like on CircleCI 2016/08/02),
    // so dispatch the mouse event directly about the nodes instead.
    function mouseEvent(type, selection) {
        var ev = new window.MouseEvent(type, { bubbles: true });
        selection.node().dispatchEvent(ev);
    }

    function selectHeader(menuIndex) {
        var headers = d3SelectAll('.' + constants.headerClassName);