shapes.content.fontSizeNumber
The font size of the shape content text.
Example
<div id="diagram"></div>
<script>
$("#diagram").kendoDiagram({
    shapes: [{
        id: "1",
        x: 100,
        y: 100,
        content: {
            text: "Large Text",
            fontSize: 20
        }
    }]
});
</script>In this article