title: Vue component not showing up
body: <p>I'm trying to run the code from <a href="https://v2.vuejs.org/v2/guide/" rel="nofollow noreferrer">Vue docs</a> about components, but the component doesn't show up. Why not?</p>
  <pre><code>&lt;html&gt;
  &lt;head&gt;
    &lt;script src=&quot;https://cdn.jsdelivr.net/npm/vue&quot;&gt;&lt;/script&gt;
  &lt;/head&gt;
  &lt;body&gt;
    &lt;div id=&quot;app&quot;&gt;
      &lt;todo-item&gt;&lt;/todo-item&gt;
    &lt;/div&gt;
    &lt;script&gt;
      Vue.component('todo-item', {
        template: '&lt;li&gt;This is a todo&lt;/li&gt;'
      })
    &lt;/script&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>