Fallback background-image if default doesn't exist

I want to set an image as a background, however the image name might be either bg.png or bg.jpg.

Is there any non-javascript way to create a fallback to an alternative image if the default background doesn't exist?

body{
    background: url(bg.png);
    background-size: 100% 100%;
    width: 100vw;
    height: 100vh;
    margin: 0;
}

You can use multiple backgrounds if there is no transparency involved and they occupy all available space or have the same size:

div{   
     background-image: url('http://placehold.it/1000x1000'), url('http://placehold.it/500x500');
     background-repeat:no-repeat;
     background-size: 100%;
     height:200px;
     width:200px;
}

<div></div>

If the first doesn't exit, the second will be displayed.

div{   
     background-image: url('http://placehol/1000x1000'), url('http://placehold.it/500x500');
     background-repeat:no-repeat;
     background-size: 100%;
     height:200px;
     width:200px;
}

<div></div>

To specify multiple possible backgrounds, you could do:

  background-color: green;
  background-image: url('bg.png'), url('bg.jpg');

This will set the background to bg.png if it exists. If it doesn't exist, it will be set to bg.jpg. If none of those images exist, the background will be set to the static green color.

Note that it will prioritize whatever image is specified first. So if both images exist, it will choose the bg.png over the bg.jpg.

Check out the demo here. Test it by breaking any of the image urls'.