Add Overlay template part area behind Experiment #73359
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scruffian
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Nov 18, 2025
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Verify "Overlays" appears in the template parts list (before "General")
Just noting that this only appears when overlays already exist.
Apart from this, everything looks good
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Annoyingly this is forcing me towards needing to raise a Core ticket to track the need for a backport. But I"m not ready to commit to this as it's an experimental feature. |
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What
Adds support for a new "Overlay" template part area type, enabling users to create and design custom mobile navigation overlays as reusable template parts. This work is part of #73079 and focuses solely on the template part area registration infrastructure.
The overlay area is gated behind the
gutenberg-customizable-navigation-overlaysexperiment flag.Why
This provides the foundation for customizable navigation overlays by allowing users to create overlay template parts. Making overlays template parts gives both users and theme authors flexibility to define bespoke mobile navigation experiences. This work establishes the template part area infrastructure needed before the Navigation block can select or assign custom overlays (which will be handled in #73080).
How
Registers the "Customizable Navigation Overlays" experiment flag (re-implementing what was in PR Add experiment flag for Customizable Navigation Overlays #73356)tableColumnAfteras a placeholder)The overlay area uses
tableColumnAftericon as a placeholder (with TODO comments) until a proper overlay icon is available.Testing Instructions
window.__experimentalNavigationOverlaysis set totruein browser console