JSFiddle - React, Tailwind, and code Playground

by iii l

HTML

<a href="#" data-tag='b'>b</a><br>
<a href="#" data-tag='tag'>tag</a><br>
<a href="#" data-tag='habr'>habr</a><br>
<textarea name="" id="" cols="30" rows="10"></textarea>

JavaScript

$('a').click(function(){
    var dt = $(this).data('tag'),
        tag = '<' + dt + '></' + dt + '>',
        t = $('textarea').val();
    $('textarea').val(t + tag);
});