JSFiddle - React, Tailwind, and code Playground

HTML

<div id="message">Move the mouse.</div>

JavaScript

var $message = $('#message');

$(window).on('mousemove', function(e) {
    if(e.clientX > e.clientY) {
        $message.text('top right triangle');
    } else {
        $message.text('bottom left triangle');
    }
});