<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Test used background images (@keyframes)</title>
<style>
blockquote::before { content: attr(id); }
video { width: 60px; }
</style>

<!-- basic -->
<style>
@keyframes internal-inline {
  from { background-image: url("internal-inline.bmp"); }
  to { transform: translateX(40px); }
}
@keyframes internal-inline-unused {
  from { background-image: url("internal-inline-unused.bmp"); }
  to { transform: translateX(40px); }
}
@keyframes internal-internal {
