ComputedValue,
                    "getComputedStyle(elem).backgroundImage after setting background-image");
}, "Changes to CSS declaration block after a base URL change");

test(function() {
  let e1 = document.createElement('div');
  let e2 = document.createElement('div');
  document.body.append(e1, e2);
  this.add_cleanup(() => {
    e1.remove();
    e2.remove();
  });
  e1.style.cssText = "all:revert;border-bottom-left-radius:1px;";
  e2.style.cssText = "all:unset;border-bottom-left-radius:1px;";
  let 