kibana-123/src/ui/public/chrome/directives/loading_indicator/loading_indicator.html

Kibana is an open source (Apache Licensed), browser based analytics and search dashboard for Elasticsearch. Kibana is a snap to setup and start using. Kibana strives to be easy to get started with, while also being flexible and powerful, just like Elastic

<div
  class="loadingIndicator"
  ng-show="chrome.httpActive.length"
  data-test-subj="globalLoadingIndicator"
>
  <div class="loadingIndicator__bar"></div>
</div>