@media (-o-min-device-pixel-ratio: 2/1) {
  .test-math-and-units {
    font: ignores 0/0 rules;
    test-division: 7em;
    simple: 2px;
  }
}
#units {
  t1: 22em;
  t2: 22em;
  t3: 2em;
  t4: 22em;
  t5: 22em;
  t6: 2em;
  t7: 22em;
  t8: 22em;
  t9: 2em;
  t10: 22em;
  t11: 22em;
  t12: 2em;
}