title: How to get iframe attribute by Javascript
body: <p>I have this HTML code on my pages:</p>
  
  <pre><code>&lt;iframe id="tubepress-video-object-1481217710" data-videoid="gCVXhS5Szbk" data-playerimplementation="youtube" data-videoprovidername="youtube" class="youtube-player" type="text/html" width="525" height="450" src="https:something..." frameborder="0" allowfullscreen&gt;&lt;/iframe&gt;    
  </code></pre>
  
  <p>The iframe's id changed everytimes the webpage reload. I can get the iframe's id by Javascript, but I don't know how to get the value of "<strong>data-videoid</strong>". 
  Any boydy can help me please?</p>