<!DOCTYPE html>
<style>
div { background: url(#); }
div { background: -webkit-image-set(url(#) 1x); }
</style>
<div style="transition: 1s">This test passes if it does not crash.</div>
<script>
if (window.testRunner) {
  testRunner.dumpAsText();
  testRunner.waitUntilDone();
}
window.addEventListener('load', function() {
  document.styleSheets[0].deleteRule(1);
  if (window.testRunner) {
    testRunner.notifyDone();
  }
});
</script>