<!DOCTYPE html>
<style>
body {
    background: url('a'), url('b');
    -webkit-animation: test 1s;
}

@-webkit-keyframes test {
    to { background: url('a'), url('b'); }
}
</style>
<pre>This test passes if it does not crash.</pre>
<script>
if (window.testRunner) {
    testRunner.dumpAsText();
    testRunner.waitUntilDone();
    requestAnimationFrame(function () {
        testRunner.notifyDone();
    });
}
</script>