How to indicate sortable elements

1. How do you indicate a column is sortable?
2. How do I make a sortable table in HTML?

How do you indicate a column is sortable?

I know that the most common way to indicate that a column is sortable is by adding a little arrow at the right or left of the column header.

How do I make a sortable table in HTML?

How to Make Sortable Tables. Adding the “sortable” class to a <table> element provides support for sorting by column value. Clicking the column headers will sort the table rows by that column's value. Tables must use <thead> and <th> tags for sortable functionality to work.