From the site: "The columns are organized left-to-right by the date an API in that column was first implemented. Older first. The rows are organized by the dat

From the site: "The columns are organized left-to-right by the date an API in that column was first implemented. Older first. The rows are organized by the date they were first proposed. The first row represents technologies that still work, but are superseded or obsoleted by newer technologies. The second-to-last row is deprecated or abandoned APIs. These may have been implemented before and removed, or only partly implemented. The last row is for APIs that only ever worked in one browser. Many of these are proprietary or vendor-specific APIs."