JSFiddle - React, Tailwind, and code Playground
HTML
<ul>
<li id="comment-1">
<div class="content"><button>reply</button></div>
<ul>
<li id="comment-3">
<div class="content"><button>reply</button></div>
</li>
</ul>
</li>
<li id="comment-2"></li>
</ul>
JavaScript
$("div.content > button").click(function(){
$(this).after("<form>some text</form>")
});