JSFiddle - React, Tailwind, and code Playground

HTML

<script src="//cdn.rawgit.com/mrdoob/three.js/master/build/three.min.js"></script>

CSS

body {
	  margin: 0;
}

JavaScript

var camera, scene, renderer;

init();
animate();

function init() {

    camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 0.01, 10 );
    camera.position.set( 0, 1, 2 );

    scene = new THREE.Scene();

    var path = new THREE.Path();
    
    path.lineTo( 0, 0.8 );
    path.quadraticCurveTo( 0, 1, 0.2, 1 );
    path.lineTo( 1, 1 );
    
    var points = path.getPoints();
    
    var geometry = new THREE.BufferGeometry().setFromPoints( points );
    var material = new THREE.LineBasicMaterial( { color: 0xffffff } );

    var curve = new THREE.Line( geometry, material );
    scene.add( curve );

    renderer = new THREE.WebGLRenderer( { antialias: true } );
    renderer.setPixelRatio( window.devicePixelRatio );
    renderer.setSize( window.innerWidth, window.innerHeight );
    document.body.appendChild( renderer.domElement );

}

function animate() {

    requestAnimationFrame( animate );
    renderer.render( scene, camera );

}