title: Bootstrap 4 Popover with formatted content
body: <p>This is in an Angular 4 application.  I want to do a popover with HTML formatted content.   Looking at the documentation and cheat sheets I find this kind of example:</p>
  
  <pre><code>&lt;button type="button" class="btn btn-secondary" data-container="body"
      data-toggle="popover" data-placement="right"
      data-content="Vivamus sagittis lacus vel augue laoreet rutrum        faucibus."&gt;
    Popover on right
  &lt;/button&gt;
  </code></pre>
  
  <p>The popover content is contained in the <strong>data-content</strong> attribute value. </p>
  
  <p>What I would rather have is a reference by ID to a section that contains the formatted content (includes tags/css).   Is there a different way of doing this?</p>