To re-use a header from a given page across several other pages, which option allows automatic content updates after changes?

Using a snippet to reuse a header across several pages offers the significant advantage of automatic content updates. When a snippet is modified, all instances of that snippet across different pages automatically reflect the changes. This is particularly useful for maintaining consistency and ensuring that any updates to shared components, like headers, are propagated everywhere they are used without the need for manual adjustments on each page.

In contrast, while other options like widgets and templates can facilitate reusability, they do not inherently offer the same automatic update capability. Widgets often require additional configuration to share styles or behaviors, and templates serve more as blueprints rather than dynamic components that automatically receive updates. A page reference typically points to another page without allowing for shared component updates, making it less suited for scenarios requiring consistent content reflection across multiple pages.