{{/* One announcement, collapsible. Newest is opened by the caller; the rest stay shut so three
     posts read as a list rather than a wall. */}}
{{define "newsitem"}}
<details class="newsitem"{{if .Open}} open{{end}}>
  <summary>{{.Item.Title}} <span class="newsdate">{{.Item.Ago}}</span></summary>
  <div class="md">{{.Item.HTML}}</div>
</details>
{{end}}