How to create opacity effect on webOS?

Tags: javascript,html,css,webos

Problem :

I have an html video element in my page :

<video id="myVideo" src = "./play.mp4" autoplay loop></video>

I am making it disappear on some action like this :

var vid = document.getElementById("myVideo"); = "hidden";

I can make it appear back again with = "visible";

But I want the video to ease in smoothly how can I do this via javascript ?

I tried :   = "visibility 2s"; = "visible";

But it didn't work. Could anyone point my mistake ? (The webOS platform doesn't support jquery and the opacity css property)

I cannot use opacity :( --> Developer documentation : The opacity property is unapplicable on video elements.

Solution :

You can use css transition and rgba format with some javascript to add opacity animation without the css opacity property.

var hide = document.getElementById('tryh'),
    show = document.getElementById('trys'),
    foo  = document.getElementById('foo');

show.addEventListener('click', function () {
  foo.className = 'foo show';

hide.addEventListener('click', function () {
  foo.className = 'foo hide';
.foo {
  position: relative;
  background: rgba(0,0,0,0);
  transition: background-color 1s;

.hide {
  background-color: rgba(255,255,255,1);

.show {
  background-color: rgba(0,0,0,0);

.foo:before {
  position: absolute;
  top: 0; right: 0; bottom: 0; left: 0;
  background-color: inherit;
  content: ' ';
<div id='foo' class='foo'>
  <video id="video" src="./play.mp4" controls autoplay loop ></video>

<button id='trys'>Show</button>
<button id='tryh'>Hide</button>

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