title: IE 11 css-vars-ponyfill only support :root variable, but not support inline varible
body: <p>inline variable not working in IE 11, even :root variable working with the help of 'css-vars-ponyfill' but inline vaiable still not working in IE 11</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>:root {
      --bg-color: black;
    }
    
    .main{display:inline-block;
    background:var(--bg-color);width:200px;height:200px;}</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script src="https://cdn.jsdelivr.net/npm/css-vars-ponyfill@2"&gt;&lt;/script&gt;
  &lt;div style="--bg-color:red" class="main"&gt;
  
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>