JSFiddle - React, Tailwind, and code Playground

HTML

<textarea id="test">Something</textarea>

JavaScript

function moveCaretToEnd(el) {
    if (typeof el.selectionStart == "number") {
        el.selectionStart = el.selectionEnd = el.value.length;
    } else if (typeof el.createTextRange != "undefined") {
        el.focus();
        var range = el.createTextRange();
        range.collapse(false);
        range.select();
    }
}

var textarea = document.getElementById("test");
textarea.onfocus = function() {
    moveCaretToEnd(this);
    
    // Work around Chrome's little problem
    textarea.onmouseup = function() {
        // Prevent further mouseup intervention
        moveCaretToEnd(this);
        textarea.onmouseup = null;
        return false;
    };
};