A Tab Separated Value spreadsheet (TSV) file that can be displayed as HTML table and edited in a spreadsheet editor.
example.csv.html contains a Tab Separated Value (TSV) spreadsheet with a <script> element as last line.
If you open it with a web browser, the TSV will be converted into a beautifull (matter of taste) HTML Table. This HTML table can be sorted just by clicking over the column header of your choice.
If you rename this file example.csv, you can open and edit it using a spreadsheet editor.
Once you're done updating the TSV, just add the .html extension back to the filename, and you can display it into your browser again.