JSFiddle - React, Tailwind, and code Playground

HTML

<input type="button"
onclick="fx(document.getElementsByTagName('textarea')[0])"
value="click me!"/><br/>
<textarea>
text
text
text
text
text
text
text
text
text
text
text
text
text
text
text
text
text
text
text
text
</textarea>

CSS

textarea{height:100px;}

JavaScript

function fx(element)
{
 element.focus();
 element.setSelectionRange(element.value.length,element.value.length);
}