As a screenreader built using pure Web technology, ChromeVox leverages many aspects of the evolving browser platform. We have put together a detailed technical overview of the design and architecture of ChromeVox in the form of a technical report. The report is published both as a PDF document as well as HTML. The content was authored in LaTeX and converted to HTML using the excellent TeX4HT package. Note that the figures in the HTML version lack the visual fidelity of the PDF version, however the HTML version loses no information and may work better with access technologies.