<button id="fab-small">Small</button>
<button id="fab-medium">Medium</button>
<button id="fab-large">Large</button>

<script>
    $('#fab-small').kendoFloatingActionButton({
        size: 'small',
        align: 'top start'
    });
    $('#fab-medium').kendoFloatingActionButton({
        size: 'medium',
        align: 'top end'
    });
    $('#fab-large').kendoFloatingActionButton({
        size: 'large',
        align: 'top center'
    });
</script>