

  box.style.borderInlineStartStyle = 'inset';
  box.style.borderInlineEndStyle = 'none';
  assert_equals(getComputedStyle(box).borderInlineStartWidth, '10px');
  assert_equals(getComputedStyle(box).borderInlineEndWidth, '0px');
  assert_equals(getComputedStyle(box).borderInlineWidth, '10px 0px');

  box.style.borderInlineStartStyle = 'none';
  box.style.borderInlineEndStyle = 'hidden';
  assert_equals(getComputedStyle(box).borderInlineStartWidth, '0px');
  assert_equals(getComputedStyle(box).borderInlineE