bootstrap-html/site/layouts/partials/callouts/danger-async-methods.md

All API methods are asynchronous and start a transition. They return to the caller as soon as the transition is started, but before it ends. In addition, a method call on a transitioning component will be ignored. [Learn more in our JavaScript docs.](/docs/{{ .Site.Params.docs_version }}/getting-started/javascript/#asynchronous-functions-and-transitions)