title: what HTML5 video listener can trigger event in the beginning of a video?
body: <p>I want to use a listener to trigger a function in the beginning of one video.
  Currently I am using:</p>
  
  <pre><code>video.addEventListener("play", function);
  </code></pre>
  
  <p>It works in desktop. However in IOS, the function only be triggered When I pause then re-start the video. So, how should I do to make a listener to trigger function just in the beginning of the video? The video may auto play or click to play.</p>
  
  <p>Thanks a lot in advanced!</p>