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The block editor canvas iframe only gets editor classes, so page-scoped styles like .post-type-archive-{type} don't apply while editing. A small editor script reads the template or post being edited and adds the matching front-end classes to the canvas body: archive-{type} templates get archive post-type-archive post-type-archive-{type}, single-{type} templates and posts get single single-{type}, and pages get page. It reapplies when the canvas iframe reloads or the edited entity changes.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AnE8gr5CL5zMoLydyGFRaZ
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Summary
The editor canvas iframe only gets editor classes, so page-scoped styles like
.post-type-archive-{type} ...don't apply in the Site Editor. This adds the matching front-end body classes to the canvas.New
VigetWP\Admin\EditorBodyClassesenqueuessrc/assets/js/editor-body-classes.js, which reads the template/post being edited:archive-{type}templates →archive post-type-archive post-type-archive-{type}single-{type}templates and posts →single single-{type}pageIt reapplies when the canvas iframe reloads or you switch templates. It's a close approximation of the front end classes, not a 1:1 copy.
Issues
Testing Instructions
.post-type-archive-{type} .wp-block-post-title { color: red; }archive-{type}template in the Site Editor<body>hasarchive post-type-archive post-type-archive-{type}and the style appliesScreenshots
N/A
🤖 Generated with Claude Code
https://claude.ai/code/session_01AnE8gr5CL5zMoLydyGFRaZ