<!DOCTYPE html>
<html>
<head>
<style>
#hr1 {
    transition: 1s;
    background: black;
}

#hr1.changed {
    background: blue;
}

</style>
<script>

if (window.testRunner)
    testRunner.dumpAsText();

function crash() {
    var hr1 = document.getElementById("hr1");
    var hr2 = document.getElementById("hr2");
    hr1.classList.add("changed");
    document.all[2].appendChild(hr2);
    var animation = document.createElement("hr3").animate({  }, 1);
    var hr1_animation_effect = hr1.getAnimations()[0].effect;
    animation.effect = hr1_animation_effect;
}

</script>
</head>
<body onload="crash()">
<hr id="hr1"></hr>
<hr id="hr2"></hr>
</body>
</html>