Olly enhanced image caption rendering in the basecamp/lexxy repository by extending DOMPurify’s configuration to support custom 'caption' and 'filename' attributes, ensuring that captions containing colons are preserved during sanitization. Using JavaScript and front end development skills, Olly addressed a bug where colons were previously stripped from captions, restoring accurate caption display and improving the user experience. The solution involved explicit attribute whitelisting, which maintained security while allowing necessary content through. Olly’s focused update resulted in a more maintainable rendering pipeline, reduced support tickets related to caption issues, and delivered clean, reproducible changes within a single repository context.