Mat-tooltip on disabled button

This doesn't work because it is triggered by mouseenter event which doesn't get fired by most browsers for disabled elements. A workaround is to add matTooltip to a parent element:
<div matTooltip="You cannot delete that" [matTooltipDisabled]="!isButtonDisabled()">
    <button mat-raised-button [disabled]="isButtonDisabled()">
        <mat-icon>delete</mat-icon>
    </button>
</div>

Source: stackoverflow.com

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