title: Block elements in rows display like inline-block in Bootstrap 4
body: <p>When placing a block-level element (e.g. <strong>h1</strong>, <strong>p</strong>, etc) in a div with class="row" causes it to behave like an inline-block element! If I remove the "row" div it shows correctly. What am I doing wrong?</p>
  
  <p>The example code below results in the heading and paragraph displaying on the same line. I would expect them to display on separate lines.</p>
  
  <p>Example code:</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-html lang-html prettyprint-override"><code>    &lt;!doctype html&gt;
      &lt;html lang="en"&gt;
          &lt;head&gt;
              &lt;meta charset="utf-8"&gt;
              &lt;meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"&gt;
              &lt;link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous"&gt;
              &lt;title&gt;Hello, world!&lt;/title&gt;
          &lt;/head&gt;
          &lt;body&gt;
  
              &lt;div class="container"&gt;
                  &lt;div class="row"&gt;
                      &lt;h1&gt;Hello, world!&lt;/h1&gt;
                      &lt;p&gt;This is a paragraph&lt;/p&gt;
                  &lt;/div&gt;
              &lt;/div&gt;
  
              &lt;script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"&gt;&lt;/script&gt;
              &lt;script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"&gt;&lt;/script&gt;
              &lt;script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"&gt;&lt;/script&gt;
          &lt;/body&gt;
      &lt;/html&gt;</code></pre>
  </div>
  </div>
  </p>