How can I present information on top of a full screened youtube video embedded on my webpage?

问题

I am developing a web application where I have a youtube video player embedded in one of my web pages. I am trying to present extra information on top of the playing video (on full screen). By extra information I mean a message with some text or maybe an image. The code for the embedded player is similar to this:

<div id="player" align="center"></div>

  <noscript>This feature requires Javascript, please turn it on</noscript>

  <script>
    // 2. This code loads the IFrame Player API code asynchronously.
    var tag = document.createElement('script');

    var uid;
    var firstStatus = 1;
    var firstTimeStamp = 0;
    // Current state of the player
    var state = -1;

    tag.src = "//www.youtube.com/iframe_api";
    var firstScriptTag = document.getElementsByTagName('script')[0];
    firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);

    // 3. This function creates an <iframe> (and YouTube player)
    //    after the API code downloads.
    var player;
    var show = getVarsFromUrl()['showId'];
    function onYouTubeIframeAPIReady() {
      player = new YT.Player('player', {
        height: '390',
        width: '640',
        videoId: show,//'a8u_a9q978M',//'u1zgFlCw8Aw',
        events: {
          'onReady': onPlayerReady,
          'onStateChange': onPlayerStateChange
        }
      });
    }

I intend to present the extra information on top of a playing video. I hope I was clear enough. Thanks!

Extra code: The style (CSS):

<style>
  body {
    padding-top: 60px; /* 60px to make the container go all the way to the bottom of the topbar */
    background-color: #222222;
    color: #C0C0C0;
  }
  img {
    position:relative;
    left:500px;
    top:500px;
    z-index:5;
  }
  iframe {
    position:absolute;
    left:500px;
    top:500px;
    z-index:-1;
  }
</style>

And the image:

<img src="smiley.png" alt="Smiley face" height="42" width="42">

回答1:

Add ?wmode=opaque to the end of the url to enable the use of z-index. Then use z-index in your CSS to layer your styles accordingly.

来源：https://stackoverflow.com/questions/15623751/how-can-i-present-information-on-top-of-a-full-screened-youtube-video-embedded-o