In Chrome 55, prevent showing Download button for HTML 5 video

This is the solution (from this post)

video::-internal-media-controls-download-button {
    display:none;
}

video::-webkit-media-controls-enclosure {
    overflow:hidden;
}

video::-webkit-media-controls-panel {
    width: calc(100% + 30px); /* Adjust as needed */
}

Update 2 : New Solution by @Remo

<video width="512" height="380" controls controlsList="nodownload">
    <source data-src="mov_bbb.ogg" type="video/mp4">
</video>

As of Chrome58 you can now use controlsList to remove controls you don't want shown. This is available for both <audio> and <video> tags.

If you want to remove the download button in the controls do this:

<audio controls controlsList="nodownload">

This can hide download button on Chrome when HTML5 Audio is used.

 #aPlayer > audio { width: 100% }
/* Chrome 29+ */
@media screen and (-webkit-min-device-pixel-ratio:0)
  and (min-resolution:.001dpcm) {
     /* HIDE DOWNLOAD AUDIO BUTTON */
     #aPlayer {
           overflow: hidden;width: 390px; 
    }

    #aPlayer > audio { 
      width: 420px; 
    }
}

/* Chrome 22-28 */
@media screen and(-webkit-min-device-pixel-ratio:0) {
    
      #aPlayer {
           overflow: hidden;width: 390px; 
        }

    #aPlayer > audio { width: 420px; }
}

<div id="aPlayer">
 <audio autoplay="autoplay" controls="controls">
  <source src="http://www.stephaniequinn.com/Music/Commercial%20DEMO%20-%2012.mp3" type="audio/mpeg" />
 </audio>
</div>

Google has added a new feature since the last answer was posted here. You can now add the controlList attribute as shown here:

<video width="512" height="380" controls controlsList="nodownload">
    <source data-src="mov_bbb.ogg" type="video/mp4">
</video>

You can find all options of the controllist attribute here:

https://developers.google.com/web/updates/2017/03/chrome-58-media-updates#controlslist