1 <link rel=
"import" href=
"chrome://resources/polymer/core-collapse/core-collapse.html">
3 <polymer-element name=
"cr-collapse">
5 <link rel=
"stylesheet" href=
"cr_collapse.css">
6 <core-collapse id=
"collapse" opened=
"{{opened}}">
10 <script src=
"cr_collapse.js"></script>