<style>
  @property --a {
    syntax: 'foo';
    inherits: false;
    initial-value: foo;
  }
</style>
<script>
  if (window.testRunner)
    testRunner.dumpAsText();

  onload = () => {
    document.open();
    document.createElement('div').style.width = '0';
    document.write("This test passes if it doesn't crash.");
  };
</script>

