Inline scripts were extracted from Polymer elements.

third_party/polymer/components-chromium/core-animated-pages/core-animated-pages.css

+:host {
+  display: block;
+  position: relative;
+}
+
+polyfill-next-selector { content: ':host > *'; }
+::content > * {
+  position: absolute;
+  top: 0;
+  right: 0;
+  bottom: 0;
+  left: 0;
+}
+
+polyfill-next-selector { content: ':host > *:not(.core-selected):not([animate])'; }
+::content > *:not(.core-selected):not([animate]) {
+  display: none !important;
+}