Inline scripts were extracted from Polymer elements.

third_party/polymer/components-chromium/core-style/elements.html

+<link rel="import" href="core-style.html">
+
+<core-style id="my-toolbar">
+  :host {
+    height: 54px;
+    font-size: 1.3rem;
+    background-color: steelblue;
+    color: white;
+  }
+
+  polyfill-next-selector {
+    content: &apos;:host &gt; *&apos;;
+  }
+  ::content &gt; * {
+    margin: 8px;
+  }
+</core-style>
+
+<polymer-element name="my-toolbar" horizontal="" center="" layout="" assetpath="">
+  <template>
+    <core-style ref="my-toolbar"></core-style>
+    <content></content>
+  </template>
+</polymer-element>
+
+<core-style id="my-panel">
+  :host {
+    display: inline-block;
+    height: 200px;
+    width: calc({{ 100 / g.columns }}% - 16px);
+    font-size: 50px;
+    background: gray;
+    margin: 8px;
+  }
+</core-style>
+
+
+
+<polymer-element name="my-panel" vertical="" center="" center-justified="" layout="" assetpath="">
+  <template>
+    <core-style ref="my-panel"></core-style>
+    <content></content>
+  </template>
+</polymer-element><script src="elements-extracted.js"></script>