<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-backgrounds-3/#background-color">
<link rel="match" href="background-color-animation-with-images-ref.html">
<style>
.container1 {
  width: 200px;
  height: 200px;
  /* Test the case where images partially occludes the background color */
  background-image: url("../support/green.png"), url("../support/red.png");
  background-size: 100px 100px;
  background-repeat: no-repeat;
  animation: blue-anim 100s;
}
.container2 {
  width: 200px;
  height: 200px;
  /* Test the case where images partially occludes the background color */
  background-image: url("../support/green.png"), url("../support/red.png");
  background-size: 100px 100px;
  background-repeat: no-repeat;
  animation: transparent-anim 100s;
}
.container3 {
  width: 100px;
  height: 100px;
  /* Test the case where images occludes the background color */
  background-image: url("../support/green.png"), url("../support/red.png");
  animation: transparent-anim 100s;
}
.container4 {
  width: 100px;
  height: 100px;
  /* Test the case where images occludes the background color */
  background-image: url("../support/green.png"), url("../support/red.png");
  animation: blue-anim 100s;
}
@keyframes blue-anim {
  0% { background-color: rgb(0, 0, 199); }
  100% { background-color: rgb(0, 0, 200); }
}
@keyframes transparent-anim {
  0% { background-color: rgba(0, 200, 0, 0); }
  100% { background-color: rgba(200, 0, 0, 0); }
}
</style>
<body>
  <div class="container1"></div>
  <div class="container2"></div>
  <div class="container3"></div>
  <div class="container4"></div>
</body>
