Flickering when using keyframes + background position on sprite sheet in IE11

Question

So I have a sprite sheet containing 16 frames of a walking animation and I intent to animate it with keyframes by changing the background position using:

animation: abc 0.55s infinite steps(1);


    @keyframes abc {
        0%  {background-position(-2250vh,-10vh);}
        6.67%   {background-position(-2100vh,-10vh);}
        13.33%  {background-position(-1950vh,-10vh);}
        ...
        100%    {background-position(0,-10vh);}
    }

It works fine in chrome and firefox but in IE, at the end of the animation, it disappears briefly before looping again. Creating a flickering effect

When I turned the animations off and manually test each position using the console, each frame is displayed correctly, so this is not due to incorrect positioning.

Answer 1

Don't animate background-position. This does cause performance issues. Instead, use img and let it be as tall as it needs. Wrap it in a div like so...

<div class="wrapper">
  <img class="image" src='some-tall-image.png'/>
</div>

Adjust the wrapper height to be as tall as a desired frame (From your keyframes i asumed it to be 150px). And set overflow:hidden on .wrapper

.wrapper {
  height:150px;
  overflow:hidden;
}

This should display only what you want to see. A single frame of your sprite-sheet. And to animate use transform:translateY() on the img

@keyframes abc {
    0%  {transform:translateY(-2250vh);}
    6.67%   {transform:translateY(-2100vh);}
    13.33%  {transform:translateY(-1950vh);}
    100%    {transform:translateY(0vh);}
}

.image {
  animation: abc ...;
}

EXAMPLE. Check it out...

BY using steps(8) I need only set the 100% keyframe of the animation. The rest gets filled in... MAGIC!... Also created a JSFiddle for ya

I borrowed the sprite sheet. Props to the creator (whose url can be seen on the code). Image is 960px wide. So in my case I used translateX instead of translateY.

@keyframes walking {
  100% { 
    transform:translateX(-960px);
   }
}

.wrapper {
  overflow:hidden;
  width:120px;
}

.image {
  animation:walking 500ms steps(8) infinite;
}

<div class="wrapper">
  <img class= "image" src="https://www.adamkhoury.com/demo/sprite_sheets/adam.png">
</div>