<script>
var workbook = new kendo.ooxml.Workbook({
  images: {
    "banner": {
      data: "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mP8/5+hHgAHggJ/PchI7wAAAABJRU5ErkJggg==",
      type: "image/png"
    }
  },
  sheets: [
      {
          drawings: [
              {
                  topLeftCell: "A1",
                  offsetX: 10,
                  offsetY: 15,
                  width: 200,
                  height: 40,
                  image: "banner"
              }
          ],
          rows: [
              { cells: [ { value: "Banner will be offset 15px down" } ] }
          ]
      }
  ]
});

workbook.toDataURLAsync().then(function(dataURL) {
  kendo.saveAs({
    dataURI: dataURL,
    fileName: "offset-y-example.xlsx"
  });
});
</script>