What I'd like to do is have a fixed-size textarea that only allows as much input as will fit in the box (based on a fixed font size) without any scrolling or resizing. (number of characters will vary as using proportional font).

I've tried all sorts of things including intercepting when a scroll bar appears, and trying to modify this jquery autosize plugin https://github.com/padolsey/jQuery.fn.autoResize#readme, but I can't get it to work properly.

Can anyone suggest the best way to go about it, or is there already a plugin to do it?