Inline scripts were extracted from Polymer elements.

third_party/polymer/components-chromium/core-splitter/core-splitter.css

+/*
+Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
+This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+Code distributed by Google as part of the polymer project is also
+subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+*/
+
+:host {
+  display: block;
+  width: 12px;
+  background: #efefef url(handle.svg) no-repeat center;
+  box-shadow: inset 0 0 2px 1px #ccc;
+  cursor: col-resize;
+}
+
+:host(.horizontal) {
+  width: auto;
+  height: 12px;
+  cursor: row-resize;
+  background-image: url(handle-h.svg);
+}
+
+:host(:hover, :active) {
+  background-color: #ddd;
+}