title: What is the purpose of webkitRelativePath property in File object?
body: <p>If you printout File object in Chrome console with something simple like this:</p>
  
  <pre><code>&lt;input type="file" onchange="console.info(this.files);" /&gt;
  </code></pre>
  
  <p>you will see among other properties an always empty <em>webkitRelativePath</em> property: </p>
  
  <pre><code>fileName: "07.png"
  fileSize: 33022
  lastModifiedDate: Date
  name: "07.png"
  size: 33022
  type: "image/png"
  webkitRelativePath: ""
  __proto__: File
  </code></pre>
  
  <p>What is it's purpose? And how it can be leveraged?</p>