Inline scripts were extracted from Polymer elements.

third_party/polymer/components-chromium/paper-menu-button/paper-menu-button.css

+/*
+Copyright 2013 The Polymer Authors. All rights reserved.
+Use of this source code is governed by a BSD-style
+license that can be found in the LICENSE file.
+*/
+
+:host {
+  display: inline-block;
+  padding: 8px;
+  position: relative;
+  background-image: none;
+  outline: none;
+  user-select: none;
+  -webkit-user-select: none;
+  cursor: pointer;
+  overflow: hidden;
+}
+
+:host([disabled]) {
+  cursor: auto;
+}
+
+core-icon {
+  position: relative;
+}
+
+core-icon::shadow svg {
+  transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
+  -webkit-transition: -webkit-transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
+  transform-origin: 50% 50%;
+  -webkit-transform-origin: 50% 50%;
+}
+
+:host(:hover) core-icon::shadow svg {
+  transform: scale(1.2);
+  -webkit-transform: scale(1.2);
+}
+
+:host([disabled]:hover) core-icon::shadow svg {
+  transform: none;
+  -webkit-transform: none;
+}
+
+:host([disabled]) core-icon::shadow path {
+  fill: #c9c9c9;
+}
+
+#overlay {
+  display: block;
+        position: fixed;
+  border-radius: 3px;
+}
+
+.paper-menu-button-overlay-ink {
+        position: absolute;
+        top: 0;
+        left: 0;
+        width: 40px;
+        height: 40px;
+        border-radius: 20px;
+  background: #fff;
+  opacity: 0;
+  transform: scale(0);
+  -webkit-transform: scale(0);
+}
+
+:host([halign="right"]) .paper-menu-button-overlay-ink {
+        left: auto;
+        right: 0;
+}
+
+.paper-menu-button-overlay-bg {
+        position: absolute;
+        top: 0;
+        left: 0;
+        bottom: 0;
+        right: 0;
+        border-radius: 3px;
+  background: #fff;
+  opacity: 0;
+}
+
+#menu {
+        position: relative;
+  margin: 0;
+}