JSFiddle - React, Tailwind, and code Playground

HTML

<div contenteditable="true" class="chat_txt"></div>

CSS

.chat_txt{
	color: #585757;
    width: 892px;
    overflow: auto;
    white-space: pre-wrap;
    border: 1px solid #d0d0d0;
    height: 132px;
    border-left: 0;
    resize: none;
    outline: none;
    font-family: Butler;
    font-size: 20px;
    background:lightgray;
}

JavaScript

$('body').on('keypress', '.chat_txt', function(e) {
console.log(e.keyCode);
       if (e.keyCode === 13) {
            var evt = $.Event('keypress');
            evt.keyCode = 40;
            console.log(evt);
            $('.chat_txt').trigger(evt);
            e.preventDefault();
            e.stopPropagation();
        }
});