sheets.rows.cells.commentString
The comment of the cell - a tooltip that appears when the cell is hovered.
Example
<div id="spreadsheet"></div>
<script>
$("#spreadsheet").kendoSpreadsheet({
sheets: [{
rows: [{
cells: [{
value: "Hover me",
comment: "This is a cell comment"
}]
}]
}]
});
</script>
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