Fix image captions with colons being stripped by DOMPurify #488
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DOMPurify validates attribute values against a URI regex unless the attribute is marked as "URI safe". The caption attribute was in ALLOWED_ATTR but not in URI_SAFE_ATTRIBUTES, causing values like "photograph: test" to be stripped because the colon made it look like an unknown protocol scheme. Adding caption and filename to ADD_URI_SAFE_ATTR prevents this validation, allowing any text content in these attributes. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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DOMPurify validates attribute values against a URI regex unless the attribute is marked as "URI safe". The
captionattribute was inALLOWED_ATTRbut not inURI_SAFE_ATTRIBUTES, causing values like "photographer: name" to be stripped because the colon made it look like an unknown protocol scheme.Adding
captionandfilenametoADD_URI_SAFE_ATTRprevents this validation, allowing any text content in these attributes.