title: drop float div to next line if too wide
body: <p>I have a box with key-value pair information.. If the value box is too wide and meets the key box then the value box must drop down under the key box</p>
  
  <p><a href="https://jsfiddle.net/nwpems8w/" rel="nofollow">https://jsfiddle.net/nwpems8w/</a></p>
  
  <p>The value on the third line must drop down under the key box? How to do that?</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>.box {
    background: #aaa;
    width: 150px;
  }
  .box_prop {
    clear: both;
    text-align: right;
  }
  .box_key {
    float: left;
  }
  .box_value {
    font-weight: bold;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="box"&gt;
    &lt;div class="box_prop"&gt;
      &lt;div class="box_key"&gt;key&lt;/div&gt;
      &lt;div class="box_value"&gt;value&lt;/div&gt;
    &lt;/div&gt;
    &lt;div class="box_prop"&gt;
      &lt;div class="box_key"&gt;key long&lt;/div&gt;
      &lt;div class="box_value"&gt;value long&lt;/div&gt;
    &lt;/div&gt;
    &lt;div class="box_prop"&gt;
      &lt;div class="box_key"&gt;key giga long&lt;/div&gt;
      &lt;div class="box_value"&gt;value giga long&lt;/div&gt;
    &lt;/div&gt;
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>