zulip/static/templates/status_emoji.hbs

{{#if emoji_alt_code}}
<span class="emoji_alt_code">&nbsp:{{emoji_name}}:</span>
{{else if still_url}}
<img src="{{still_url}}" class="emoji status_emoji" data-animated-url="{{url}}" data-still-url="{{still_url}}" />
{{else if url}}
{{!-- note that we have no still_url --}}
<img src="{{url}}" class="emoji status_emoji" data-animated-url="{{url}}" />
{{else if emoji_code}}
<span class="emoji status_emoji emoji-{{emoji_code}}"></span>
{{/if}}