# Collapsible details

> Hide optional detail behind an accessible disclosure control.


{{< details title="What does the search index contain?" >}}
Titles, descriptions, breadcrumbs, tags, H2 and H3 headings, and page text.
{{< /details >}}

```md
{{</* details title="What does the search index contain?" */>}}
Titles, descriptions, breadcrumbs, tags, headings and page text.
{{</* /details */>}}
```

Add `open="true"` to start expanded. Do not hide information that every reader
must see before completing a task.


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Source: https://projectious-work.github.io/brand-theme-hugo-vanilla/v0.3.3/docs/features/collapsible-details/index.md