<!DOCTYPE HTML>
<script>
if (window.testRunner) {
    testRunner.dumpAsText();
    testRunner.waitUntilDone();
}
</script>
<style>
@keyframes bgimage {
    from {
        background-image: url("non-existent.png");
    }
    to {
        background-image: url("non-existent-2.png");
    }
}
div {
    animation-duration: 0.1s;
    animation-name: bgimage;
}
</style>
<div onanimationend="testRunner.notifyDone()">
Test content extension inserting a display:none rule triggered by a resource in a keyframe.
</div>
<div class="hidden">
FAIL
</div>