<!DOCTYPE html>
<style>
.filter {
  filter: url(#foo);
}
</style>
<div class="filter"></div>
<div class="filter"></div>
<button form="bar"></button>
<script>
if (window.testRunner)
  testRunner.dumpAsText();
onload = function() {
  document.body.innerHTML = "PASS if no crash";
}
</script>