How to add tooltip in kendo combobox?

Check StackBlitz project and suggest how to add tooltips to the dropdown, so that I am able to see tooltips for 'Small,' 'Medium,' and 'Large' dropdowns which is mentioned in StackBlitz project?

You can define a template for the items of the combobox, specifically kendoComboBoxItemTemplate.

Place the following inside your combobox:

<kendo-combobox [allowCustom]="true"
                [data]="data"
                [textField]="'text'"
                [valueField]="'value'"
                [filterable]="true"
                (filterChange)="handleFilter($event)"
                [placeholder]="'T-shirt size'">
    <ng-template kendoComboBoxItemTemplate let-dataItem>
        <div [title]="dataItem.text">{{dataItem.text}}</div>
    </ng-template>
</kendo-combobox>

You can place anything you want or need in the title attribute to serve as a tooltip.