title: Anchor's Download Property is not working on some pages (Gmail)?
body: <p>I want to insert this HTML element in some pages:</p>
  
  <pre><code>&lt;a download="somedata.csv"
     id="downloadLink"
     href="data:application/csv;charset=utf-8,Col1%2CCol2%2CCol3%0AVal1%2CVal2%2CVal3%0AVal11%2CVal22%2CVal33%0AVal111%2CVal222%2CVal333"
  &gt;
      Click Me
  &lt;/a&gt;
  </code></pre>
  
  <p>In all pages, when I change the dom via plugin or manually in elements inspector, to include this element to page's dom, it works great ! <br>
  But, if I do the same in Gmail pages, the file generated is not named "<code>somedata.csv</code>" and the extension is lost "<code>csv</code>" !</p>
  
  <p>I tried this in local file, in file uploaded to localhost, and in many external website pages, it works in all except for Gmail pages. </p>
  
  <p><strong>Why it doesn't work in Gmail pages ? And how to fix this ?</strong></p>