Default display with no options:

To produce the above:

<script type="module" src="https://unpkg.com/t-zones/t-zones.js?module"></script>
...
<t-zones></t-zones>
    

Or with specific timezones selected:

To produce the above:

<t-zones zones="Europe/Rome,America/New_York,America/Phoenix,US/Pacific,Pacific/Tahiti,Pacific/Auckland,Australia/Brisbane,Australia/Perth,UTC"></t-zones>