title: CSS flex-item align self not working with flex-wrap parent
body: <p>I have a flex parent container set to <code>flex-wrap: wrap</code> and <code>justify-content: flex-end</code>. I have one flex-child, <code>button-group</code> which i want to align to flex-start, but <code>align-self</code> is not working. </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>.container{
    width: 500px;
    height: 500px;
    background: pink;
    
    display: flex;
    justify-content: flex-end;
    flex-wrap: wrap;
  }
  
  .button-group {
    background: lightblue;
    align-self: flex-start; /* Not working!*/
    padding: 5px 10px;
  }
  
  .main-box {
    width: 450px;
    height: 300px;
    background: lime;
  }
  
  .myfooter {
    width: 50%;
    height: 10%;
    background-color: black;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="container"&gt;
   &lt;div class="button-group"&gt;
    &lt;button&gt;&lt;/button&gt;
    &lt;button&gt;&lt;/button&gt;
    &lt;button&gt;&lt;/button&gt;
   &lt;/div&gt;
  
   &lt;div class="main-box"&gt;&lt;/div&gt;
   &lt;div class="myfooter"&gt; &lt;/div&gt;
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>How can I get the button group to align itself to the left while preserving the flex wrap?</p>