HTML columns have no type, so, for example, sorting a date column would not give the expected order. HTML table cells admit arbitrary HTML, so there's no easy c

HTML columns have no type, so, for example, sorting a date column would not give the expected order. HTML table cells admit arbitrary HTML, so there's no easy comparability, there. Sort orders even for understood data vary greatly; sometimes a lexicographical order is sufficient, sometimes you want special handling of numbers within text, sometimes you want a case-insensitive order. Locale of the data and the user can affect sorting greatly. And that's without even getting into editing, grouping and filtering. Basically, it would be hugely complicated, require significant additions to the HTML of tables and would probably be no more successful than the built-in date-pickers of browsers, which always get replaced to get a nice look or behavior.