Google Spreadsheets predates the Writely purchase and in any case, that purchase was in 2006, 6 years ago, so almost certainly Google Docs is 2-3 code rewrites

Google Spreadsheets predates the Writely purchase and in any case, that purchase was in 2006, 6 years ago, so almost certainly Google Docs is 2-3 code rewrites past whatever the Writely team wrote.