Add Numbering to Pre and Textarea – line-numbers Web Component
A lightweight web component for adding line numbers to pre & textarea elements. Supports custom start numbers and CSS styling.
JavaScript & CSS Line Numbers
Add Line Numbers To Texarea Element – ta-ln.js
ta-ln.js is a tiny (less than 1kb) JavaScript solution to add line numbers to the native textarea element.
JavaScript Library For Editable Box with Line Numbers – NumberedTextBox
NumberedTextBox is a pure JavaScript library that converts an html element into an editable, resizable text box with support for line numbers.