title: Vue Devtools not working locally
body: <p><code>Vue Devtools</code> works on all demos/examples online but not on my local pages. Even with the following, the <code>Vue Devtools</code> icon remains gray ("Vue.js not detected"). Why?</p>
  
  <pre><code>&lt;html&gt;
  &lt;head&gt;
    &lt;script src="https://cdn.jsdelivr.net/npm/vue"&gt;&lt;/script&gt;
  &lt;/head&gt;
  &lt;body&gt;
    &lt;div id="app"&gt;&lt;/div&gt;
    &lt;script&gt;    
      Vue.config.devtools = true;
    &lt;/script&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>