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Since we dropped --embed-resources (so RevealJS plugins like chalkboard work), pandoc no longer tries to fetch referenced media for HTML output, so a missing image or video produces no compile-time warning — it only renders broken in the browser. PDF/Typst output is unaffected because Typst hard-errors on a missing image. After an HTML render, QuartoRunner now scans output.html for local media references (img/video/audio/iframe src, poster, RevealJS data-background-*) and appends a `[WARNING] Missing resource: …` line to output.log for any that don't exist on disk. External URLs, data URIs, anchors and Quarto's own generated <basename>_files assets are ignored. The [WARNING] prefix is recognised by the Quarto/Typst log parser, so these show up in the Warnings tab. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>