我有一个简单的聚合物应用：
<!DOCTYPE html>
<html>
<head>
<title></title>
<meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes">
<meta http-equiv="x-ua-compatible" content="IE=10" >
<script type="text/javascript" src="components/webcomponentsjs/webcomponents.js"></script>
<link rel="import" href="components/font-roboto/roboto.html">
<link rel="import" href="viewer-app.html">
<style>
html,body {
background-color: #fff;
font-family: 'RobotoDraft', sans-serif;
}
</style>
</head>
<body fullbleed vertical layout unresolved>
<template is="auto-binding">
<viewer-app fit></viewer-app>
</template>
</body>
自定义元素'viewer-app'甚至没有显示在f12工具中 . 我根本没有收到任何错误 .
我如何让它工作？