Polymer's iron-list won't show -

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i'm playing google's polymer library , have trouble iron-list component. not rendered , no error thrown.

here html:

<!doctype html> <html lang="en"> <head>     <meta charset="utf-8">     <meta http-equiv="x-ua-compatible" content="ie=edge">     <meta name="description" content="odtimetracker - ui test polymer">     <meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1, user-scalable=yes">     <title>odtimetracker</title>     <script src="bower_components/webcomponentsjs/webcomponents-lite.min.js"></script>     <link rel="import" href="bower_components/font-roboto/roboto.html">     <link rel="import" href="bower_components/iron-icons/iron-icons.html">     <link rel="import" href="bower_components/paper-styles/classes/typography.html">     <link rel="import" href="bower_components/iron-image/iron-image.html">     <link rel="import" href="bower_components/iron-flex-layout/iron-flex-layout.html">     <link rel="import" href="bower_components/paper-toolbar/paper-toolbar.html">     <link rel="import" href="bower_components/paper-scroll-header-panel/paper-scroll-header-panel.html">     <link rel="import" href="bower_components/paper-icon-button/paper-icon-button.html">     <link rel="import" href="bower_components/iron-ajax/iron-ajax.html">     <link rel="stylesheet" href="styles.css"> </head> <body unresolved>     <template is="dom-bind" id="app">         <iron-ajax auto url="activities-json.php" handle-as="json"                    last-response="{{data}}"></iron-ajax>         <paper-scroll-header-panel class="fit" condenses keep-condensed-header>             <paper-toolbar class="tall">                 <paper-icon-button icon="arrow-back"></paper-icon-button>                 <div class="flex"></div>                 <paper-icon-button icon="search"></paper-icon-button>                 <paper-icon-button icon="more-vert"></paper-icon-button>                 <div class="bottom title">odtimetracker</div>             </paper-toolbar>             <iron-list items="[[data.items]]" as="item">                 <template>                     <div>                         <div class="item">                             <b><code>[[item.activityid]]</code></b>                             <div class="pad">                                 <div class="primary">[[item.name]]</div>                                 <div class="secondary">[[item.started]] &ndash; [[item.stopped]]</div>                                 <div class="secondary dim">[[item.description]]</div>                             </div>                             <iron-icon icon$="[[iconforitem(item)]]"></iron-icon>                         </div>                     </div>                 </template>             </iron-list>         </paper-scroll-header-panel>     </template>     <script> document.queryselector('template[is=dom-bind]').iconforitem = function(item) {     return item ? (item.stopped == '' ? 'star-border' : 'star') : ''; };  document.addeventlistener('paper-header-transform', function(event) {     var title = this.queryselector('.title');     var detail = event.detail;     var deltaheight = detail.height - detail.condensedheight;     var scale = math.max(0.6, (deltaheight - detail.y) / (deltaheight / 0.4)  + 0.6);      polymer.base.transform('scale(' + scale + ') translatez(0)', title); });     </script> </body> </html>

problem not in consumed json (because it's working in other test written) , can not figure problem is. code above results blank page header rendered.

it looks forgot import iron-list, throw in:

<link rel="import" href="bower_components/iron-list/iron-list.html">

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