Worked on enhancing content fidelity in the microsoft/roosterjs repository by developing and integrating a pasteWhiteSpaceFormatParser into the sanitizing context. This feature was designed to ignore pre-existing whitespace during paste operations, addressing issues with unintended whitespace changes and ensuring more accurate content handling. The implementation involved updating the sanitization pipeline so that the new parser would process all pasted content, thereby improving the consistency of the editor’s behavior. The work leveraged JavaScript and TypeScript, with a focus on DOM manipulation and content model expertise. No major bugs were recorded as fixed during this period, reflecting a targeted feature contribution.