assert_equals(sheet3.cssRules.length, 1);
  assert_equals(sheet3.cssRules[0].cssText, redStyleTexts[1]);

  sheet3.deleteRule(0);
  assert_equals(sheet3.cssRules.length, 0);
}, 'new CSSStyleSheet produces empty CSSStyleSheet');

test(() => {
  const sheet = new CSSStyleSheet({title: "something"});
  assert_equals(sheet.title, null, "title and alternate are not supported by the constructor. https://github.com/WICG/construct-stylesheets/issues/105");
}, "title can be set in the CSSStyleSheet constructor");

p