docs: function applyDomExtension($ui, options) {
                  var NO_RIPPLE_CLASS = [
                      ".ui-ripple-none",
                      ".ui-flipswitch-on",
                      ".ui-slider-handle",
                      ".ui-input-clear",
                  ];
                  var selector = ".ui-btn";
                  if ($ui.hasClass("ui-page")) {
                      selector = ".ui-content .ui-btn"; // header は自動 ripple 化対象外
                  }
                  $ui.find(selector)
                      .filter(function (index, elem) {
                      var $elem = $(elem);
                      if ($elem.is(NO_RIPPLE_CLASS.join(","))) {
                          return false;
                      }
                      else {
                          return true;
                      }
                  })
                      .addClass("ui-ripple");
                  // ripplify
                  $ui.find(".ui-ripple")
                      .each(function (index, elem) {
                      $(elem).ripple(options);
                  });
                  return $ui;
              }