Google Fonts delivers free, open source, fonts to billions of pages across the web. In recent years we have improved our quality and added support for a range of languages but were never able to support Chinese, Japanese, or Korean.
Recently we have explored, validated, and shipped a CSS-only solution, leveraging unicode-range and Google's web index data to intelligently partition fonts to minimize transfer size, number of requests, and latency and optimize cross-site caching when delivering Korean fonts. We believe our solution will also apply to Japanese, Simplified Chinese, and Traditional Chinese.