threshold-ui/ui/desktop/app/components/copyable/index.hbs

<span
  id={{this.id}}
  class='copyable'
  {{did-insert this.register}}
  {{will-destroy this.tearDown}}
>

  {{#if this.copied}}
    <mark class='copyable-content'>
      {{yield}}
    </mark>
  {{else}}
    <span class='copyable-content'>
      {{yield}}
    </span>
  {{/if}}

  {{#if this.isClipboardLibrarySupported}}
    <Rose::Button
      id={{this.copyableButtonId}}
      aria-describedby={{this.id}}
      class='copyable-button'
      @style='ghost'
      @iconOnly={{if this.copied this.successIcon this.actionIcon}}
      title={{if this.copied this.successText this.actionText}}
    >
      {{this.actionText}}
    </Rose::Button>
  {{/if}}
</span>