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Why AI-Generated SVGs Often Fail to Render: Eight Recurring Defects

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AI-generated SVG files frequently display as blank frames despite looking syntactically plausible. Because SVG is strict XML, a single syntax error, such as an unescaped ampersand or an unclosed tag, can cause the entire file to be rejected silently. Language models produce SVG by predicting tokens without validating the XML or checking geometry, so they repeatedly make the same mistakes. The author identifies eight common defects, including a missing xmlns attribute, incorrect or missing viewBox values, off-canvas shapes, NaN coordinates, stray chat prose and code fences, and shapes styled with fill="none" but no stroke. The article offers a diagnostic checklist for locating which defect is present and mentions a tool, SVG Repair, that automatically cleans and fixes such files.

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