/  assert_equals(sheet.cssRules.length, 1);
//  assert_equals(
//    sheet.cssRules[0].cssText,
//    '@media screen and (color) {\n}'
//  );
//}, 'features - de-duplication');

test(function(t) {
  var sheet = makeSheet(t);
  sheet.insertRule('@media print and (max-width: 23px) and (max-width: 45px) {}');

  assert_equals(sheet.cssRules.length, 1);
  assert_equals(
    sheet.cssRules[0].cssText,
    '@media print and (max-width: 23px) and (max-width: 45px) {\n}'
  );
}, 'features - preservation of overspec