In WordPress 7.1, the Custom HTML block supports interleaving static HTML with regular, editable blocks (79115):

 Static heading 
Editable paragraph
 Static footer

In the editor, the static markup renders inert while the inner blocks are editable in place — but locked: they can’t be moved, removed, or have siblings added. The surrounding structure stays intact. The full markup remains accessible in the “Edit HTML” modal, and serialization round-trips unchanged, so existing content is unaffected.

This also makes block markup a friendlier target for AI tools: a model can generate one

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