title: iPhone scroll bug when swiping on a textbox
body: <p>I have <a href="http://neptune.tandola.com/iphonebug.htm" rel="noreferrer">a webpage</a> with the following html:</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;html&gt;
  &lt;head&gt;
      &lt;meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1, user-scalable=0"&gt;
      &lt;link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css"&gt;
  &lt;/head&gt;
  &lt;body&gt;
      &lt;div style='display:flex;flex-direction:column;height:100%;'&gt;
          &lt;div style='overflow:auto'&gt;
              &lt;div style='height:500px; background:green;'&gt;&lt;/div&gt;
              &lt;div class='container'&gt;
                  &lt;div class='row'&gt;
                      &lt;div class='col-sm-6'&gt;
                          &lt;input type='text' style='' class='form-control' placeholder='swipe here' /&gt;
                      &lt;/div&gt;
                  &lt;/div&gt;
              &lt;/div&gt;
              &lt;div style='height:500px; background:blue;'&gt;&lt;/div&gt;
          &lt;/div&gt;
      &lt;/div&gt;
  &lt;/body&gt;
  &lt;/html&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>Load it on an iPhone. Try scrolling up and down by swiping. Now try scrolling by starting a swipe at the textbox that says 'swipe here'. With me, it won't scroll when I do that. I'm using an iPhone 6S.</p>
  
  <p>Is this a bug? How can I work around it?</p>