ridTemplateRows, gridTemplateColumns)
{
  var gridElement = document.getElementById(id);
  gridElement.style.gridTemplateRows = gridTemplateRows;
  gridElement.style.gridTemplateColumns = gridTemplateColumns;
}

function testGridItemDefinitions(gridItemData)
{
  var item = document.getElementById(gridItemData.id);
  item.setAttribute("data-expected-width", gridItemData.width);
  item.setAttribute("data-expected-height", gridItemData.height);
  item.setAttribute("data-offset-x", gridItemData.x);
  item.setAt