Result Size: 625 x 534
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<!DOCTYPE html>
<html>
<body>
<p>此示例使用 HTML DOM 将“onplay”事件分配给视频元素。</p>
<p>按下播放键。</p>
<video controls id="myVideo">
  <source src="mov_bbb.mp4" type="video/mp4">
  <source src="mov_bbb.ogg" type="video/ogg">
  您的浏览器不支持 HTML5 video 视频。
</video>
<p>视频由 <a href="https://www.bigbuckbunny.org/" target="_blank">Big Buck Bunny</a> 提供。</p>
<script>
document.getElementById("myVideo").onplay = function() {myFunction()};
function myFunction() {
  alert("The video has started to play.");
}
</script>
</body>
</html>