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embed-resources cannot be enabled from the CLI: Quarto only honours it when nested under the format, and a document's own format block fully overrides project/CLI metadata (confirmed in Quarto docs). So --metadata embed-resources was silently ignored and the 'standalone' HTML was the ordinary non-embedded deck referencing a sibling _files/ dir — unstyled, no math, no images once downloaded on its own. For the html-standalone export, render a temporary copy of the root .qmd with embed-resources/self-contained-math enabled and chalkboard disabled inside its revealjs block (replacing an existing chalkboard key rather than duplicating it), then clean the temp file up. Falls back to the original file if the deck isn't an editable nested-revealjs document, so the export is never worse than before. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>