ThemeRouter documentation
Preview & Validation
Preview installed themes privately and validate a redesign before assigning it to visitors.
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Theme Compatibility and Validation Checklist
Validate templates, menus, assets, plugins, SEO, accessibility, and performance before assigning a theme.
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Preview Mode vs Theme Assignment
Choose between a private temporary preview and a persistent visitor-facing theme assignment.
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Preview an Installed WordPress Theme Privately
Preview an installed theme as an authorized user without changing the public active theme.