   data-offset-x="15" data-offset-y="15" data-expected-width="515" data-expected-height="315">
  </div>
  <div class="absolute" style="grid-column: 1 / 2; grid-row: foo / 1;"
    data-offset-x="15" data-offset-y="15" data-expected-width="100" data-expected-height="315">
  </div>
  <div class="absolute" style="grid-column: foo / 1; grid-row: 1 / 2;"
    data-offset-x="15" data-offset-y="15" data-expected-width="515" data-expected-height="50">
  </div>
  <div class="absolute" style="grid-column: 3 / foo; grid