on: import-internal 3s linear infinite; }
</style>
<link rel="stylesheet" href="link-ref.css">
<style>@import "import-ref.css";</style>

<!-- reference -->
<style>
@keyframes ref-from-to {
  from { background-image: url("ref-from.bmp"); }
  to { background-image: url("ref-to.bmp"); }
}

@keyframes ref-from-to-noncaptured {
  from { background-image: url("ref-from-noncaptured.bmp"); }
  to { background-image: url("ref-to-noncaptured.bmp"); }
}

@keyframes ref-percent {
  0% { background-image: url("ref-0.bmp