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if (listFactory === void 0) { listFactory = function (el) { return new MDCList(el); }; }
this.menuSurfaceFactory_ = menuSurfaceFactory;
if (listFactory === void 0) { listFactory = function (el) { return new MDCList(el); }; }
var listEl = this.root_.querySelector("." + MDCListFoundation.cssClasses.ROOT);