Sections may be **collapsible**. <a href="https://github.com/observablehq/framework/releases/tag/v1.6.0" class="observablehq-version-badge" data-version="^1.6.0" title="Added in 1.6.0"></a> If the **open** option is set, the **collapsible** option defaults to true; otherwise it defaults to false. If the section is not collapsible, the **open** option is ignored and the section is always open; otherwise, the **open** option defaults to true. A section will open automatically if the current page belongs to that section.
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