Test block error handling and complete Prepublish result navigation - #25
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Change
Add explicit error checks for unsupported block content. Page-to-block-to-page navigation and initial block context must produce no browser console errors or unhandled exceptions. A packaged-CMS regression publishes a real shared block, checks the controlled 400 for a direct page-URL request, opens the block, and returns to page editing without block URL requests or new server errors/type-mismatch logs. The server guard retains counts only and is disabled in live mode.
Also follow Accessibility → Level A before looking for the image alternative issue in live Prepublish results.
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